Voice Banwidth Delay

[Kuwait Energy]

Dear All ,

I am Facing Voice delay in Cisco Call manager ,Recently we shifted our New Office ....Still on off my Voice Gateway is Connecting Through Data link Connection ....Mostly I am Face Delay ....Like when ever i am calling any External Number ,the receiver cannot able to hear my Voice ...

Is there is Any Way to solve this is issue and this High Priority ............

[paolo bevilacqua]

Assuming that you are the end user, and not a Voice Networking Engineer, do you work with a reputable consultant, or UC certified Cisco Partner?

If not, you should, because experience and knowledge are required when working on IP voice systems.

[David Matthews]

The following QoS configuration was put in place and the issue was resolved:

------------------

QOS: MQC  - apply in THIS order

 

step 1 (optional) define ACL

step 2 define class-map 

         call ACL above or match something like rtp, dscp, prec)

step 3 define policy-map

         call class-map(s) above and allocated bandwidth & set action

step 4 apply the policy-map on step 3 to interfaces or DLCI

--------------------

 

MQC EXAMPLE (logical presentation - be sure to apply in the order listed
ABOVE)

==============

 

!! this first part is the shaper which then calls the QoS service policy
further down

policy-map MQC       

  class class-default

    shape average 1425000  << based on 1.5 Meg pipe 95% of uplink speed
<< 

    service-policy QOS

 

 

 

policy-map QOS

  class voice-RTP 

    priority 1050 << based on leaving 375K of a 1.5 Meg link available.

    set dscp ef 

!! more details of voice-RTP in the class-map below

 

  class voice-control   

    bandwidth 75    << based on leaving 375 K of a 1.5 Meg link
available.

    set dscp af31

!! more details of voice-control in the class map below

 

  class class-default

    fair-queue

 

!! end policy-map QoS

!! class-map details below

 

class-map match-any voice-control

  match ip dscp af31

  match ip dscp cs3

  match access-group 101

!! more details on the access list below - choose type of control
h323/sip/mgcp, etc

 

class-map match-any voice-RTP

  match ip dscp ef

  match ip rtp  16384 16383

  match access-group name AutoQos-VOIP-RTP

!! more details on the access list below - deals with the ports 16384
through 32767

 

!

!

 

ip access-list extended AutoQos-VoIP-RTP

   permit udp any any range 16384 32767

 

!

!

 

!! details on ACCESS-LIST 101 depends upon type of control we are using.

 

!For MGCP

access-list 101 permit udp any any eq 2427

access-list 101 permit tcp any any eq 2428

 

!For H.323

access-list 101 permit tcp any any range 1718 1720

access-list 101 permit tcp any any eq 1731

 

!For Skinny (phones registered to CCM)

access-list 101 permit tcp any any eq 2000

 

!For Sip

access-list 101 permit tcp any any eq 5060

 

 

!!-------------------------------

!! DO NOT FORGET TO APPLY MQC (or QoS if you choose not to shape) TO AN
INTERFACE

!!-------------------------------

interface x/x

service-policy output MQC

 

 

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end MQC EXAMPLE

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