SG300 voice vlan problem with UC520

Hi Forumers'
My problem statement:
- refere to attached topology.png, this is how my network structure look like
- the IP phone after boot cannot get connected, so it can't download the XML config file from UC520. suspicious switching problem.
- my configuration shown at topology.png and my vlan voice config show as voice vlan setting.png
- My requirement is SG300 switch single switchport to carry vlan data and vlan voice.
- what is the trunking mode for voice VLAN siwth a IP phone+data should i configure? is it switchport voice vlan vvid, switchport voice vlan dot1p, switchport voice vlan untagged or switchport voice vlan none to suite above requirement?
thanks
Noel

Hello Noel,
Sorry for the late reply, things have been quite hectic around here lately
1. Why use trunk? the UC520 only have vlan voice (vlan 20)
Do you mean that the data VLAN is handled by another device ? Still I would leave it as a trunk in order to be able manage the UC through the data VLAN. (Unless for security or other reasons you would choose otherwise of course)
2. The UC520 got CUE (voice messaging), how should i design the service module uplink to the core switch?
Nothing in particular has to be done for this, CUE is handled and routed inside the UC520, the CUE vlan (default ID =90) is only used if you have another CUE in the network
1. i guess i did this: swithcport tagged vlan 20, untagged vlan 10. is it ok for this setting?
If the Voice Vlan on the switch and on the UC520 has been defined as VLAN 20 (default = VLAN 100) this is perfect. Verify if both on the UC and on the switch, the voice VLAN ID is set to 20.
1. so if i just point the phone to vlan 20 (vlan voice), should i create the LLDP network policy?
If you are ready to configure the VLAN manually on the phone, you don't need the LLDP policy, that is correct.
The LLDP policy is being used for having the phones automatically choose the VLAN you defined, so you don't need to set it manually.
Hope this answers your questions ?
Best regards,
Nico Muselle
Sr. Network Engineer - CCNA

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    - create a network policy to assign VLAN 200
    - assign this network policy to the port the phone is connected to.
    I  hope this information help to help me to setup Data and Voice vlans, to  plug the phone to work with vlan Voice 200 (IP rang 192.168.22.X), from  phone to Pc and pc work as Data vlan 2 (IP rang 192.168.2.X).

    I just got done setting up voice VLANs on an SF 300-24P and verified working.  This was working with Cisco 7900 series phones connected to a Cisco UC setup.
    Here's my sample config.
    Note that I edited this by hand before posting, so doing a flat out tftp restore probably won't work.  However, this should give you a clue.  Also, don't take this as 100% accurate or correct.  I've only been working with these things for about a week, though I've worked with the older Linksys SRW switches for a couple of years.  I'm a CCNP/CCDP.
    VLAN 199 is my management VLAN and is the native VLAN on 802.1q trunks.
    VLAN 149 is the data/computer VLAN here.
    VLAN 111 is the voice/phone VLAN here.
    VLAN 107 does nothing.
    interface range ethernet e(1-24)
    port storm-control broadcast enable
    exit
    interface ethernet e1
    port storm-control include-multicast
    exit
    interface ethernet e2
    port storm-control include-multicast
    exit
    interface ethernet e3
    port storm-control include-multicast
    exit
    interface ethernet e4
    port storm-control include-multicast
    exit
    interface ethernet e5
    port storm-control include-multicast
    exit
    interface ethernet e6
    port storm-control include-multicast
    exit
    interface ethernet e7
    port storm-control include-multicast
    exit
    interface ethernet e8
    port storm-control include-multicast
    exit
    interface ethernet e9
    port storm-control include-multicast
    exit
    interface ethernet e10
    port storm-control include-multicast
    exit
    interface ethernet e11
    port storm-control include-multicast
    exit
    interface ethernet e12
    port storm-control include-multicast
    exit
    interface ethernet e13
    port storm-control include-multicast
    exit
    interface ethernet e14
    port storm-control include-multicast
    exit
    interface ethernet e15
    port storm-control include-multicast
    exit
    interface ethernet e16
    port storm-control include-multicast
    exit
    interface ethernet e17
    port storm-control include-multicast
    exit
    interface ethernet e18
    port storm-control include-multicast
    exit
    interface ethernet e19
    port storm-control include-multicast
    exit
    interface ethernet e20
    port storm-control include-multicast
    exit
    interface ethernet e21
    port storm-control include-multicast
    exit
    interface ethernet e22
    port storm-control include-multicast
    exit
    interface ethernet e23
    port storm-control include-multicast
    exit
    interface ethernet e24
    port storm-control include-multicast
    exit
    interface range ethernet g(1-4)
    description "Uplink trunk"
    exit
    interface range ethernet g(1-4)
    switchport default-vlan tagged
    exit
    interface range ethernet e(21-24)
    switchport mode access
    exit
    vlan database
    vlan 107,111,149,199
    exit
    interface range ethernet g(1-4)
    switchport trunk allowed vlan add 107
    exit
    interface range ethernet e(21-24)
    switchport access vlan 111
    exit
    interface range ethernet g(1-4)
    switchport trunk allowed vlan add 111
    exit
    interface range ethernet e(1-20)
    switchport trunk native vlan 149
    exit
    interface range ethernet g(1-4)
    switchport trunk allowed vlan add 149
    exit
    interface range ethernet g(1-4)
    switchport trunk native vlan 199
    exit
    voice vlan aging-timeout 5
    voice vlan oui-table add 0001e3 Siemens_AG_phone________
    voice vlan oui-table add 00036b Cisco_phone_____________
    voice vlan oui-table add 00096e Avaya___________________
    voice vlan oui-table add 000fe2 H3C_Aolynk______________
    voice vlan oui-table add 0060b9 Philips_and_NEC_AG_phone
    voice vlan oui-table add 00d01e Pingtel_phone___________
    voice vlan oui-table add 00e075 Polycom/Veritel_phone___
    voice vlan oui-table add 00e0bb 3Com_phone______________
    voice vlan oui-table add 108ccf MyCiscoIPPhones1
    voice vlan oui-table add 40f4ec MyCiscoIPPhones2
    voice vlan oui-table add 8cb64f MyCiscoIPPhones3
    voice vlan id 111
    voice vlan cos 6 remark
    interface ethernet e1
    voice vlan enable
    exit
    interface ethernet e1
    voice vlan cos mode all
    exit
    interface ethernet e2
    voice vlan enable
    exit
    interface ethernet e2
    voice vlan cos mode all
    exit
    interface ethernet e3
    voice vlan enable
    exit
    interface ethernet e3
    voice vlan cos mode all
    exit
    interface ethernet e4
    voice vlan enable
    exit
    interface ethernet e4
    voice vlan cos mode all
    exit
    interface ethernet e5
    voice vlan enable
    exit
    interface ethernet e5
    voice vlan cos mode all
    exit
    interface ethernet e6
    voice vlan enable
    exit
    interface ethernet e6
    voice vlan cos mode all
    exit
    interface ethernet e7
    voice vlan enable
    exit
    interface ethernet e7
    voice vlan cos mode all
    exit
    interface ethernet e8
    voice vlan enable
    exit
    interface ethernet e8
    voice vlan cos mode all
    exit
    interface ethernet e9
    voice vlan enable
    exit
    interface ethernet e9
    voice vlan cos mode all
    exit
    interface ethernet e10
    voice vlan enable
    exit
    interface ethernet e10
    voice vlan cos mode all
    exit
    interface ethernet e11
    voice vlan enable
    exit
    interface ethernet e11
    voice vlan cos mode all
    exit
    interface ethernet e12
    voice vlan enable
    exit
    interface ethernet e12
    voice vlan cos mode all
    exit
    interface ethernet e13
    voice vlan enable
    exit
    interface ethernet e13
    voice vlan cos mode all
    exit
    interface ethernet e14
    voice vlan enable
    exit
    interface ethernet e14
    voice vlan cos mode all
    exit
    interface ethernet e15
    voice vlan enable
    exit
    interface ethernet e15
    voice vlan cos mode all
    exit
    interface ethernet e16
    voice vlan enable
    exit
    interface ethernet e16
    voice vlan cos mode all
    exit
    interface ethernet e17
    voice vlan enable
    exit
    interface ethernet e17
    voice vlan cos mode all
    exit
    interface ethernet e18
    voice vlan enable
    exit
    interface ethernet e18
    voice vlan cos mode all
    exit
    interface ethernet e19
    voice vlan enable
    exit
    interface ethernet e19
    voice vlan cos mode all
    exit
    interface ethernet e20
    voice vlan enable
    exit
    interface ethernet e20
    voice vlan cos mode all
    exit
    interface ethernet e1
    lldp optional-tlv port-desc sys-name sys-desc sys-cap 802.3-mac-phy 802.3-lag 802.3-max-frame-size
    exit
    interface ethernet e2
    lldp optional-tlv port-desc sys-name sys-desc sys-cap 802.3-mac-phy 802.3-lag 802.3-max-frame-size
    exit
    interface ethernet e3
    lldp optional-tlv port-desc sys-name sys-desc sys-cap 802.3-mac-phy 802.3-lag 802.3-max-frame-size
    exit
    interface ethernet e4
    lldp optional-tlv port-desc sys-name sys-desc sys-cap 802.3-mac-phy 802.3-lag 802.3-max-frame-size
    exit
    interface ethernet e5
    lldp optional-tlv port-desc sys-name sys-desc sys-cap 802.3-mac-phy 802.3-lag 802.3-max-frame-size
    exit
    interface ethernet e6
    lldp optional-tlv port-desc sys-name sys-desc sys-cap 802.3-mac-phy 802.3-lag 802.3-max-frame-size
    exit
    interface ethernet e7
    lldp optional-tlv port-desc sys-name sys-desc sys-cap 802.3-mac-phy 802.3-lag 802.3-max-frame-size
    exit
    interface ethernet e8
    lldp optional-tlv port-desc sys-name sys-desc sys-cap 802.3-mac-phy 802.3-lag 802.3-max-frame-size
    exit
    interface ethernet e9
    lldp optional-tlv port-desc sys-name sys-desc sys-cap 802.3-mac-phy 802.3-lag 802.3-max-frame-size
    exit
    interface ethernet e10
    lldp optional-tlv port-desc sys-name sys-desc sys-cap 802.3-mac-phy 802.3-lag 802.3-max-frame-size
    exit
    interface ethernet e11
    lldp optional-tlv port-desc sys-name sys-desc sys-cap 802.3-mac-phy 802.3-lag 802.3-max-frame-size
    exit
    interface ethernet e12
    lldp optional-tlv port-desc sys-name sys-desc sys-cap 802.3-mac-phy 802.3-lag 802.3-max-frame-size
    exit
    interface ethernet e13
    lldp optional-tlv port-desc sys-name sys-desc sys-cap 802.3-mac-phy 802.3-lag 802.3-max-frame-size
    exit
    interface ethernet e14
    lldp optional-tlv port-desc sys-name sys-desc sys-cap 802.3-mac-phy 802.3-lag 802.3-max-frame-size
    exit
    interface ethernet e15
    lldp optional-tlv port-desc sys-name sys-desc sys-cap 802.3-mac-phy 802.3-lag 802.3-max-frame-size
    exit
    interface ethernet e16
    lldp optional-tlv port-desc sys-name sys-desc sys-cap 802.3-mac-phy 802.3-lag 802.3-max-frame-size
    exit
    interface ethernet e17
    lldp optional-tlv port-desc sys-name sys-desc sys-cap 802.3-mac-phy 802.3-lag 802.3-max-frame-size
    exit
    interface ethernet e18
    lldp optional-tlv port-desc sys-name sys-desc sys-cap 802.3-mac-phy 802.3-lag 802.3-max-frame-size
    exit
    interface ethernet e19
    lldp optional-tlv port-desc sys-name sys-desc sys-cap 802.3-mac-phy 802.3-lag 802.3-max-frame-size
    exit
    interface ethernet e20
    lldp optional-tlv port-desc sys-name sys-desc sys-cap 802.3-mac-phy 802.3-lag 802.3-max-frame-size
    exit
    interface ethernet e21
    lldp optional-tlv port-desc sys-name sys-desc sys-cap 802.3-mac-phy 802.3-lag 802.3-max-frame-size
    exit
    interface ethernet e22
    lldp optional-tlv port-desc sys-name sys-desc sys-cap 802.3-mac-phy 802.3-lag 802.3-max-frame-size
    exit
    interface ethernet e23
    lldp optional-tlv port-desc sys-name sys-desc sys-cap 802.3-mac-phy 802.3-lag 802.3-max-frame-size
    exit
    interface ethernet e24
    lldp optional-tlv port-desc sys-name sys-desc sys-cap 802.3-mac-phy 802.3-lag 802.3-max-frame-size
    exit
    interface ethernet g1
    lldp optional-tlv port-desc sys-name sys-desc sys-cap 802.3-mac-phy 802.3-lag 802.3-max-frame-size
    exit
    interface ethernet g2
    lldp optional-tlv port-desc sys-name sys-desc sys-cap 802.3-mac-phy 802.3-lag 802.3-max-frame-size
    exit
    interface ethernet g3
    lldp optional-tlv port-desc sys-name sys-desc sys-cap 802.3-mac-phy 802.3-lag 802.3-max-frame-size
    exit
    interface ethernet g4
    lldp optional-tlv port-desc sys-name sys-desc sys-cap 802.3-mac-phy 802.3-lag 802.3-max-frame-size
    exit
    interface ethernet e1
    lldp med notifications topology-change enable
    exit
    interface ethernet e2
    lldp med notifications topology-change enable
    exit
    interface ethernet e3
    lldp med notifications topology-change enable
    exit
    interface ethernet e4
    lldp med notifications topology-change enable
    exit
    interface ethernet e5
    lldp med notifications topology-change enable
    exit
    interface ethernet e6
    lldp med notifications topology-change enable
    exit
    interface ethernet e7
    lldp med notifications topology-change enable
    exit
    interface ethernet e8
    lldp med notifications topology-change enable
    exit
    interface ethernet e9
    lldp med notifications topology-change enable
    exit
    interface ethernet e10
    lldp med notifications topology-change enable
    exit
    interface ethernet e11
    lldp med notifications topology-change enable
    exit
    interface ethernet e12
    lldp med notifications topology-change enable
    exit
    interface ethernet e13
    lldp med notifications topology-change enable
    exit
    interface ethernet e14
    lldp med notifications topology-change enable
    exit
    interface ethernet e15
    lldp med notifications topology-change enable
    exit
    interface ethernet e16
    lldp med notifications topology-change enable
    exit
    interface ethernet e17
    lldp med notifications topology-change enable
    exit
    interface ethernet e18
    lldp med notifications topology-change enable
    exit
    interface ethernet e19
    lldp med notifications topology-change enable
    exit
    interface ethernet e20
    lldp med notifications topology-change enable
    exit
    interface ethernet e21
    lldp med notifications topology-change enable
    exit
    interface ethernet e22
    lldp med notifications topology-change enable
    exit
    interface ethernet e1
    lldp med enable network-policy poe-pse
    exit
    interface ethernet e2
    lldp med enable network-policy poe-pse
    exit
    interface ethernet e3
    lldp med enable network-policy poe-pse
    exit
    interface ethernet e4
    lldp med enable network-policy poe-pse
    exit
    interface ethernet e5
    lldp med enable network-policy poe-pse
    exit
    interface ethernet e6
    lldp med enable network-policy poe-pse
    exit
    interface ethernet e7
    lldp med enable network-policy poe-pse
    exit
    interface ethernet e8
    lldp med enable network-policy poe-pse
    exit
    interface ethernet e9
    lldp med enable network-policy poe-pse
    exit
    interface ethernet e10
    lldp med enable network-policy poe-pse
    exit
    interface ethernet e11
    lldp med enable network-policy poe-pse
    exit
    interface ethernet e12
    lldp med enable network-policy poe-pse
    exit
    interface ethernet e13
    lldp med enable network-policy poe-pse
    exit
    interface ethernet e14
    lldp med enable network-policy poe-pse
    exit
    interface ethernet e15
    lldp med enable network-policy poe-pse
    exit
    interface ethernet e16
    lldp med enable network-policy poe-pse
    exit
    interface ethernet e17
    lldp med enable network-policy poe-pse
    exit
    interface ethernet e18
    lldp med enable network-policy poe-pse
    exit
    interface ethernet e19
    lldp med enable network-policy poe-pse
    exit
    interface ethernet e20
    lldp med enable network-policy poe-pse
    exit
    interface ethernet e21
    lldp med enable network-policy poe-pse
    exit
    interface ethernet e22
    lldp med enable network-policy poe-pse
    exit
    lldp med network-policy 1 voice vlan 111 vlan-type tagged
    interface range ethernet e(1-22)
    lldp med network-policy add 1
    exit
    interface vlan 199
    ip address 199.16.30.77 255.255.255.0
    exit
    ip default-gateway 199.16.30.3
    interface vlan 1
    no ip address dhcp
    exit
    no bonjour enable
    bonjour service enable csco-sb
    bonjour service enable http  
    bonjour service enable https 
    bonjour service enable ssh   
    bonjour service enable telnet
    hostname psw1
    line console
    exec-timeout 30
    exit
    line ssh
    exec-timeout 30
    exit
    line telnet
    exec-timeout 30
    exit
    management access-list Management1
    permit ip-source 10.22.5.5 mask 255.255.255.0
    exit
    logging 199.16.31.33 severity debugging description mysysloghost
    aaa authentication enable Console local
    aaa authentication enable SSH tacacs local
    aaa authentication enable Telnet local
    ip http authentication tacacs local
    ip https authentication tacacs local
    aaa authentication login Console local
    aaa authentication login SSH tacacs local
    aaa authentication login Telnet local
    line telnet
    login authentication Telnet
    enable authentication Telnet
    password admin
    exit
    line ssh
    login authentication SSH
    enable authentication SSH
    password admin
    exit
    line console
    login authentication Console
    enable authentication Console
    password admin
    exit
    username admin password admin level 15
    power inline usage-threshold 90
    power inline traps enable
    ip ssh server
    snmp-server location in-the-closet
    snmp-server contact [email protected]
    ip http exec-timeout 30
    ip https server
    ip https exec-timeout 30
    tacacs-server host 1.2.3.4 key spaceballz  timeout 3  priority 10
    clock timezone -7
    clock source sntp
    sntp unicast client enable
    sntp unicast client poll
    sntp server 199.16.30.1
    sntp server 199.16.30.2
    ip domain-name mydomain.com
    ip name-server  199.16.5.12 199.16.5.13
    ip telnet server

  • Voice VLAN with SRW224G4P

    Hi all,
    I have been trying to config a voice vlan into this switchs for the last 3 hours and for me this is impossible... I know how to do in a IOS switch but with this switchs is a nightmare...
    I have this topology,
    PC ---- IP phone ----- SW1 SRW224G4P -------- SWCORE SRW2024 --------- Router 2921 CME
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    interface GigabitEthernet0/0
    no ip address
    duplex auto
    speed auto
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    description LAN
    encapsulation dot1Q 1 native
    ip address 192.168.5.95 255.255.255.0
    ip virtual-reassembly in
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    description Voice VLAN
    encapsulation dot1Q 100
    ip address 192.168.251.1 255.255.255.0
    ip virtual-reassembly in
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    SWCORE has created the VLAN 100 and enabled as VOICE VLAN
    The port that is conected to SW1 has the vlan 100 configured as tagged.
    The port that is conected to router CME has the vlan 100 configured as tagged.
    If I config other port into SWCORE with VLAN 100 tagged I can ping from CME to that host.
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    Somebody could help me? I am desperate...
    Thank you in advance.

    Hi David,
    Thank you for the purchase of the switch.
    .Like anything,  even riding a bike,  the switch is actually very easy to configure, if you have a little bit of practice on it.. 
    You mentioned you are using the " Telephony OUI Table" i guess you have a SF300-24P or ordering p/n SRW224G4P-K9-NA.  Please be specific with the switch models you are using. 
    Are you using the older SRW series or the refreshed SRWxxx-K9 (300 series) switch in the core?
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    CDP is enabled on the switch when you use the new software, it was not there with older firmware, hence my insistance at upgrading firmware.
    ( Personally  i would prefer you to have a catalyst switch for your ISRG2 CME application, for tech support purposes. But this is the land of the free..)
    I found the following when I added my SG300-28P  to a VLAN aware UC500.
    The UC500  was advertising vlan100 as a voice vlan, configured that by Cisco Configuration Assistant, you might try CCP on your ISR.
    I had a IP phone plugged into switch port G7 and a uplink to my UC500 via port Gig27. 
    The following in blue is a screen copy from my 300 series switch CLI interface.
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    ------------------ show system ------------------
    System Description:                       28-port Gigabit PoE Managed Switch
    System Up Time (days,hour:min:sec):       00,00:12:04
    System Contact:                          
    System Name:                              switch4cf17c
    System Location:                         
    System MAC Address:                       d0:d0:fd:4c:f1:7c
    System Object ID:                         1.3.6.1.4.1.9.6.1.83.28.2
    Fans Status:                              OK
    ------------------ show version ------------------
    SW version   1.1.0.73 ( date  19-Jun-2011 time  18:10:49 )
    Boot version  1.0.0.4 ( date  08-Apr-2010 time  16:37:57 )
    HW version    V01
      Gateway IP Address        Activity status       Type  
    192.168.10.1            Active                  dhcp    
        IP Address         I/F       Type       Status   
    192.168.10.17/24    vlan 1    DHCP        Valid      
    ------------------ show ipv6 interface ------------------
    IPv6 is disabled on all interfaces
    ------------------ show running-config ------------------
    interface gigabitethernet7
    storm-control broadcast level 10
    exit
    interface gigabitethernet7
    storm-control include-multicast
    exit
    interface  gi27
    spanning-tree link-type point-to-point
    exit
    vlan database
    vlan 100
    exit
    voice vlan oui-table add 0001e3 Siemens_AG_phone________
    voice vlan oui-table add 00036b Cisco_phone_____________
    voice vlan oui-table add 00096e Avaya___________________
    voice vlan oui-table add 000fe2 H3C_Aolynk______________
    voice vlan oui-table add 0060b9 Philips_and_NEC_AG_phone
    voice vlan oui-table add 00d01e Pingtel_phone___________
    voice vlan oui-table add 00e075 Polycom/Veritel_phone___
    voice vlan oui-table add 00e0bb 3Com_phone______________
    hostname switch4cf17c
    no passwords complexity enable
    no snmp-server server
    interface gigabitethernet7
    macro description ip_phone_desktop
    exit
    interface gigabitethernet27
    macro description "switch | no_switch | switch"
    exit
    interface gigabitethernet7
    !next command is internal.
    macro auto smartport dynamic_type ip_phone_desktop
    switchport trunk allowed vlan add 100
    exit
    interface gigabitethernet27
    !next command is internal.
    macro auto smartport dynamic_type switch
    switchport trunk allowed vlan add 100
    exit
    switch4cf17c#sh cdp nei
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                      S - Switch, H - Host, I - IGMP, r - Repeater, P - VoIP Phone
                      M - Remotely-Managed Device, C - CAST Phone Port,
                      W - Two-Port MAC Relay
      Device ID        Local      Adv  Time To Capability   Platform     Port ID
                       Interface  Ver. Live
    SEP503De50F133A      gi7      2     158      H P     CISCO IP        eth0
                                                         Phone
                                                         SPA525G2
    68bdab0fdcfd        gi27      2     169      S I     Cisco SG         gi9
                                                         300-10P
                                                                                               (PID:SRW2008P-K9)-VSD
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    Vlan       Name                   Ports                Type     Authorization
    1           1                gi1-28,Po1-8           Default      Required
    100         100                 gi7,gi27            permanent    Required
    Switch automatically figures which ports should be tagged into VLAN 100.
    I did not tell the switch it was connected to VLAN100. I did not add vlan100 to the VLAN database.
    So get the ISR router to advertise VLAN100 as a voice vlan.
    regards Dave

  • Silent Monitor and Call record with voice vlan

    We are pretty new to CCX, and want to get silent monitor and call recording working. I've read a bunch of troubleshooting docs, and a bunch of the discussions here, but I am still unable to get it to work the way that I want.
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    Hi
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    Have you tried alternate PCs/laptops on the back of that phone?
    Aaron

  • Voice quality problems on iPhone 5s with IOS 7.02 on Verizon.I

    I have a brand new iPhone 5s with IOS 7.02 on Verizon.  Everything works great except when on talk on the phone the normal way.  When I do that, people tell me they can hardly hear me.  But, when I put them on the speaker phone, they can hear me very well.  Also, Voice Memos, and SIri all work just fine.  It is only when I talk on the phone the normal way (without the speakerphone on) that the voice quality I am transmitting is very low.  Does anyone know how to fix this?  Thanks very much.

    Apple helped me solve this problem.  They gave me a brand new iPhone 5s.  The were just great in their support.  It appears that my first iPhone 5s had a faulty "audio chip."  This is the chip that changes the frequency of your voice as you talk into the microphone; Apple explained that it is one frequency when talking on the phone, and another where using the speakerphone, and another when using Siri, and another when using voice memos, etc. You use the same 2 microphones for all of these applications (one at the bottom of the phone, and one my the camera lens), but the "audio chip" adjusts the freqency based on the applicaiton you are using.  So, on my first iPhone 5s, my "audio chip" was defective, so they gave me a new iPhone 5s, and it has been working just fine.  I had the most current IOS operating system on the original iPhone 5s with the faulty "audio chip," and on my new iPhone 5s which works great.  Hope this helps.  The technicians at Apple Customer Care and at the Apple Store are very aware of this problem with potentially defective "audio chips" in some of the iPhone 5s's.  Cheers, Clarence from Cleveland.

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