Problems with SNOM 7XX phones and presence of Lync Edge server

Question

Hi to all,
we have this problem, this is the scenario (two Lync 2013 st ed. servers):
- lync 2013 FE server have internal IP address 172.21.212.XXX with internal gateway 172.21.212.254
- lync 2013 edge server have two network interface:
First INTERFACE: 3 IPs in 172.21.30.XXX (Access, web and A/V Edge) for external connection with 172.21.30.254 and internal gateway (IP NAT with public IP)
Second INTERFACE: IP 172.21.212.XXX for internal connection without gateway
- snom 7XX (50 phones) are connect to the lync server and all internal call works fine. All phones are in an internal dedicated network 172.21.218.XXX with default gateway 172.21.218.254
- when making external call with 7XX SNOM phones, the call was routed to Trunk COLT with Lync Mediation server and all works fine.
- when Lync Mediation server receive a call from our trunk COLT we have this situation:
All Lync 2013 clients work fine, audio is OK, (network 172.21.216.XXX)
Polycom CX3000 work fine audio is OK (network 172.21.218.XXX)
SNOM 710, 720, 760  FW 8.8.2.16 UC series,  phones ring but NO SOUNDS from the phones and after a few seconds "Call failed due to network issues."
The only way to solve the problem is to disable the connection with Lync Edge server (remove gateway 172.21.30.254)
BUT this is not the solution because now we have no connection with INTERNET (skype, web conferencing doesen't work without edge gateway)
Why SNOM phones try to use the EDGE gateway to connect the call? Why doesn't use Lync Mediation server?
Can you help us to find a solution?
Thanks
Aurelio

Answer 1

Hi,
Thanks to all for yours support.
Today, we have done some test (no employee in office today
J) and we have solved the problems.
The old implementation have had this configuration:
- the phone numbers have had a no E.164 format compliant: for all users number, the phone number have had this format TEL:012345XYZW ; EXT=XYZW with the normalization
rules:
Starting digits: 01234567
Length: At least 8 digits
Digit to remove: 0
Digit to add: nothing
Pattern to match ^(01234567\d*)$
All worked fine with this previous configuration:
Lync 2010 std with only mediation server function + Lync 2013 std front-end with all the others functions and Lync 2013 std Edge server for external connection with
Lync client Skype world, BUT we have had disabled in SNOM phones ICE function because if ICE was enabled no voice can we hear from the phones.
After dismissed Lync 2010 with only a Lync 2013 infrastructure, this configuration don’t permit to use edge server because with ICE enabled or disabled no voice from
SNOM phones.
Today we have done this operation:
Setting in Lync 2013 control panel all number for all users, in E.164 format compliant:
The phone number now have this format TEL:[phone]XYZW ; EXT=XYZW and we have deleted the previous normalization roles.
We have added this role for the EXT numbers:
Name: Routing Interno
Starting Digits: XY
Length: Exactly 4 (i.e. XYZW)
Digit to remove 0
Digit to add: [phone]
Pattern to match: ^(XY\d(2))$
Translation rule: [phone]$1
Internal extension = checked
And now all work fine.
We have solved another problem:
Lync client 2013 can't find new users:
all new Lync users are not discovered from Lync 2013 client, probably because this setting is present with Lync 2010:
PS C:\> Get-CsAddressBookConfiguration
Identity                  
: Global
RunTimeOfDay              
: 1:30 AM
KeepDuration              
: 30
SynchronizePollingInterval : 00:00:30
MaxDeltaFileSizePercentage : 20
UseNormalizationRules     
: True
IgnoreGenericRules        
: False
EnableFileGeneration      
: True
With only Lync 2013 servers we have changed
IgnoreGenericRules to True
To set UseNormalizationRules and IgnoreGenericRules to true for Lynk 2013 infrastructure.
http://technet.microsoft.com/en-us/library/jj205160.aspx
For us all the problems are SOLVED!
Aurelio