Rtp payload conversion 99 to 101

[blackswans]

Hi,

Is there a way to change the incoming rtp payload type 99 to 101 in the cisco voice gateway (IAD)

Regards.

[Daniele Giordano]

If you want change the outgoing rtp payload you can use this command:

rtp payload-type

To identify the payload type of a Real-Time Transport Protocol (RTP) packet, use the rtp payload-type command in dial-peer configuration mode. To remove the RTP payload type, use the no form of this command.

rtp payload-type {cisco-cas-payload number| cisco-clear-channel number | cisco-codec-fax-ack  number | cisco-codec-fax-ind number | cisco-fax-relay number |  cisco-pcm-switch-over-alaw number | cisco-pcm-switch-over-ulaw number|  cisco-rtp-dtmf-relay number | nte number | nse number} [comfort-noise {13 | 19}]

no rtp payload-type nte

If you want change the incoming rtp payload received by your IAD you can use CUBE feature.

More info in this document:

http://www.cisco.com/en/US/products/sw/voicesw/ps5640/products_configuration_example09186a0080982499.shtml

Regards.

[blackswans]

Even I use the rtp payload-type nte 101 as you can see from the debug rtp payload is 99.

dial-peer voice 10 voip

preference 1

destination-pattern xxxx

no modem passthrough

session protocol sipv2

session target ipv4:y.y.y.y

dtmf-relay rtp-nte

codec g711ulaw

no vad

*Mar  3 23:13:18.226:  << Pt:99     Evt:9       Pkt:07 00 00

*Mar  3 23:13:18.226:          Pt:99     Evt:9       Pkt:07 00 00  >>

*Mar  3 23:13:18.230:  << Pt:99     Evt:9       Pkt:07 00 00

*Mar  3 23:13:18.230:          Pt:99     Evt:9       Pkt:07 00 00  >>

*Mar  3 23:13:18.230:  << Pt:99     Evt:9       Pkt:07 00 00

*Mar  3 23:13:18.230:          Pt:99     Evt:9       Pkt:07 00 00  >>

*Mar  3 23:13:18.282:  << Pt:99     Evt:9       Pkt:07 01 98

*Mar  3 23:13:18.282:          Pt:99     Evt:9       Pkt:07 01 98  >>

*Mar  3 23:13:18.326:  << Pt:99     Evt:9       Pkt:07 03 28

*Mar  3 23:13:18.326:          Pt:99     Evt:9       Pkt:07 03 28  >>

*Mar  3 23:13:18.378:  << Pt:99     Evt:9       Pkt:07 04 B8

*Mar  3 23:13:18.378:          Pt:99     Evt:9       Pkt:07 04 B8  >>

*Mar  3 23:13:18.426:  << Pt:99     Evt:9       Pkt:07 06 48

*Mar  3 23:13:18.426:          Pt:99     Evt:9       Pkt:07 06 48  >>

[Daniele Giordano]

I don't understand your problem. The rtp-nte payload is dynamic and is negotiated in the SIP/SDP message.

Do you have problem with DTMF?

Can you try to add "rtp payload-type nte 99"?

Regards.

[blackswans]

As you know there are two legs for the calls in voice routers. I receive payload size 99 and I want to convert to 101 for the second leg. But I understand from your last post that this cannot be converted.

[Daniele Giordano]

In my opinion the only way to get this is enable IP2IP gateway function with the command "allow connection sip to sip" and enable the CUBE feature to modify incoming SDP message and change the payload 99 in 101.

Regards.