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Community Member

MTP or Transcoder

Hi,

I've a CCM4.3 with several regions ( each regionn with his own h323 gateway ).

Call inside the same region are g.711, calls between different region are g.729.

When arrive a PST call on a region to an IP phone and the phone tranfer the call on another ip-phone IN THE SAME REGION all works fine.

If the call is being tranferred to another REGION does not work ( because the g.729 from different region ).

On the CCM is configured s SW MTP ( the ccm ).

Does I need an IOS MTP or Trancoder ?

Or I've to set the "MTP required" on gateway config ?

I can use c2811 with PVDMII

Any help ?

3 REPLIES
Bronze

Re: MTP or Transcoder

can you post your h323 with dial peer and voice codec class configuration.

I am looking to see if your inbound dial peers that send calls to call manager are set to attempt to use a voice codec class that includes both codecs.

Because in order to transfer from IP Phone to IP Phone no external transcoder is required.

example

voice class codec 1

codec preference 1 g711ulaw

codec preference 2 g729br8

codec preference 3 g729r8

!

dial-peer voice 100 voip

description To Call Manager

voice-class codec 1

session target ipv4:

incoming called-number .

no vad

Community Member

Re: MTP or Transcoder

Hi,

here the config of the VG; when i Transfer the call to a ip-phone on another region ( talking with the first in G729 ), the ipphone ring-out, but the call go disconnected when the user on that region pickup the call.

...

...

voice class codec 99

codec preference 1 g711ulaw

codec preference 2 g711alaw

codec preference 4 g729r8

codec preference 5 g729br8

codec preference 6 g723ar53

codec preference 7 g723ar63

codec preference 8 g723r53

codec preference 9 g723r63

codec preference 10 g726r16

codec preference 11 g726r24

codec preference 12 g726r32

codec preference 13 g728

...

...

dial-peer voice 2000 voip

destination-pattern 105385T

progress_ind setup enable 3

voice-class codec 99

voice-class h323 99

session target ipv4:10.168.1.1

dtmf-relay h245-alphanumeric

fax rate disable

ip qos dscp cs5 media

ip qos dscp cs3 signaling

!

dial-peer voice 2001 voip

destination-pattern 105385T

progress_ind setup enable 3

voice-class codec 99

session target ipv4:10.168.1.2

dtmf-relay h245-alphanumeric

fax rate disable

ip qos dscp cs5 media

ip qos dscp cs3 signaling

Community Member

Re: MTP or Transcoder

Hi,

I've solved the issue using a 2801 with PVDMII64, and configuring transcoding ( see bottom for the config ).

Then I've added to the callmanager as transcoder Cisco IOS Enhanced Media Termination Point.

The only issue is that i see also a lot og G711u transcoding and not only G729.

I already had MTP sotware ( the ccm ), but it seem it does not trancode in G729.

Any suggest ?

regards

Luigi

=====

sccp local FastEthernet0/0

sccp ccm 10.168.1.1 identifier 1 version 4.0

sccp ccm 10.168.1.2 identifier 2 version 4.0

sccp ip precedence 3

sccp

!

sccp ccm group 999

bind interface FastEthernet0/0

associate ccm 1 priority 1

associate ccm 2 priority 2

associate profile 10 register MTP-ios203

keepalive retries 5

switchover method immediate

switchback method immediate

switchback interval 15

!

dspfarm profile 10 transcode

codec g729ar8

codec g729abr8

codec g711ulaw

maximum sessions 24

associate application SCCP

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