Can I divide my Bandwidth dedicated for VoIP

Hi All,
Please advice me what I wanted to do is possible or not.
I have 128 kbps Bandwidth leased line circuit to my branch office in Singapore and I would like to dedicated assign 64 kbps of my bandwidth for VoIP traffice. The rest traffic with go with another 64 kbps.
I am using cisco 1760 routers and is it possible to do?
Any advice will be appreciated.

Bevilacqua,
I just configure on two Routers. Once I finised the configuration. I saw below output with not packets transfering.
Router#sh policy-map interface
Serial0/1
Service-policy output: llq
Class-map: voice (match-all)
0 packets, 0 bytes
5 minute offered rate 0 bps, drop rate 0 bps
Match: dscp ef
Queueing
Strict Priority
Output Queue: Conversation 40
Bandwidth 32 (kbps) Burst 800 (Bytes)
(pkts matched/bytes matched) 0/0
(total drops/bytes drops) 0/0
Class-map: class-default (match-any)
3269 packets, 2187341 bytes
5 minute offered rate 57000 bps, drop rate 0 bps
Match: any
Router#
After I made some ph calls. I can see below output showing packets transfering.
Router#sh policy-map interface
Serial0/1
Service-policy output: llq
Class-map: voice (match-all)
5045 packets, 322159 bytes
5 minute offered rate 5000 bps, drop rate 0 bps
Match: dscp ef
Queueing
Strict Priority
Output Queue: Conversation 40
Bandwidth 32 (kbps) Burst 800 (Bytes)
(pkts matched/bytes matched) 3115/128688
(total drops/bytes drops) 0/0
Class-map: class-default (match-any)
16895 packets, 10045657 bytes
5 minute offered rate 81000 bps, drop rate 0 bps
Match: any
Router#
So, is it working fine now? How can I check it is actually reserver the bandwidth for voice?
Thanks for your kind help.

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467170     Number of PERM messages not acknowledged
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172415     Number of messages discarded due to queue length
25880     Number of existing connections dropped
3407     Number of failed new connection attempts
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10.67.15.146 (eid: 0, port: 30011)
Environment configured as a replication master
331726/3574994     Next LSN to be used
0/0     Not waiting for any missed log records
328872/466092     Maximum permanent LSN
0     Next page number expected
0     Not waiting for any missed pages
0     Number of duplicate master conditions originally detected at this site
2147M     Current environment ID (2147483647)
100     Current environment priority
49     Current generation number
50     Election generation number for the current or next election
2323     Number of duplicate log records received
0     Number of log records currently queued
6768     Maximum number of log records ever queued at once
55284     Total number of log records queued
120M     Number of log records received and appended to the log (120475988)
111     Number of log records missed and requested
2147M     Current master ID (2147483647)
2     Number of times the master has changed
0     Number of messages received with a bad generation number
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12     Number of messages ignored due to pending recovery
471869     Number of failed message sends
12M     Number of messages sent (12959945)
0     Number of new site messages received
1     Number of environments believed to be in the replication group
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0     Number of page records received and added to databases
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1     Number of times the master has changed
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2     Number of messages ignored due to pending recovery
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1912307     Number of messages sent
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0     Number of environments believed to be in the replication group
0     Transmission limited
0     Number of outdated conditions detected
0     Number of duplicate page records received
0     Number of page records received and added to databases
0     Number of page records missed and requested
Startup incomplete
110568     Number of transactions applied
80     Number of startsync messages delayed
0     Number of elections held
0     Number of elections won
No election in progress
0     Number of bulk buffer sends triggered by full buffer
0     Number of single records exceeding bulk buffer size
0     Number of records added to a bulk buffer
0     Number of bulk buffers sent
0     Number of re-request messages received
0     Number of request messages this client failed to process
0     Number of request messages received by this client
Edited by: 899585 on 2013-1-4 下午10:54
Edited by: 899585 on 2013-1-4 下午10:55

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Thank you for choosing Cisco,
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class P3
bandwidth percent 25
random-detect
Since on the egree PE towords the internet, I'm using subinterface thus, the configuration is:
policy-map cust-qos
class class-default
shape average 256000
service-policy output QoS
interface FastEthernet1/0.8
encapsulation dot1q 8
ip address ...
service-policy output cust-qos
Since the internet access is 256K, I've configured shape average 256000.
My problem is that, during high congestion at internet access, I noticed that on cust-hub my VoIP SIP is having problem to ring to another VoIP SIP within the same hub. Is it because of the shape command ?
thanks in advanced

Hi Maher,
shape average 256000 is to much. The point is, that you have OSI layer2 overhead and layer2 keepalives and such. Lower it to f.e. 240000. You might need to "play" a little with the parameter, as the overhaed depends on average packet size.
Also make sure, that your SIP traffic is marked with af31. Just as a note: Cisco changed from marking voip signaling with af31 to cs3. Take a sniffer and check that proper markings are in place for voip signaling. Or just try
class-map match-any P2
match ip dscp af31 cs3
Hope this helps! Please rate all posts.
Regards, Martin

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