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How to change RTP Payload Type in CUCM


May be somebody know how to change RTP payload type in cucm?

I will very appreciate for your answer!


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How to change RTP Payload Type in CUCM

And why, can you tell the full problem ?

Community Member

Re: How to change RTP Payload Type in CUCM

Hello Paolo!

Thank you for your response! I very appreciate it!

The full problem is:

I try to integrate third-party SIP Device (Mobotix T24), CUCM and cisco ip phone 8945. I've registered Mobotix T24 on CUCM as third-party SIP device (advanced) and also I've registered cisco ip phone 8945 as SIP device.

When I call from any endpoint (Mobotix T24 or cisco phone 8945) I can establish just audio call between t24 and phone 8945.  When I check call status on cisco phone I see it's receiving video streem with resolution 352x288 but the video never ever displays on cisco phone 8945.

I checked logs from CUCM and I see that third party-device advertise video with rtp payload type - 103 98

SIP/2.0 200 OK

Via: SIP/2.0/UDP;branch=z9hG4bK14f4065f789

From: <5007>;tag=3824~26574cc5-a750-4483-972d-d6dd16fee221-31947893

To: <3003>;tag=1887240230

Call-ID: 497e0800-245160b9-b1-d66a8c0@

CSeq: 101 INVITE

Contact: <3003>

Content-Type: application/sdp

User-Agent: Linphone/3.0.0 MX Video (eXosip2/3.1.0)

Content-Length:   466


o=3003 123456 654321 IN IP4

s=A conversation

c=IN IP4

t=0 0

m=audio 7078 RTP/AVP 0 8 3 101


a=rtpmap:0 PCMU/8000/1

a=rtpmap:8 PCMA/8000/1

a=rtpmap:3 GSM/8000/1

a=rtpmap:101 telephone-event/8000

a=fmtp:101 0-11

m=video 9078 RTP/AVP 103 98


a=rtpmap:103 H264/90000

a=fmtp:103 profile-level-id=42800d;packetization-mode=1;level-asymmetry-allowed=1

a=rtpmap:98 H263-1998/90000

a=fmtp:98 CIF=1;QCIF=1

but cisco ip phone advertise video with rtp payload type - 126 97

INVITE sip:3003@;user=phone SIP/2.0

Via: SIP/2.0/TCP;branch=z9hG4bK60dae47a

From: "5007" <5007>;tag=8478acedb7e500ae04185099-2be5d845

To: <3003>

Call-ID: 8478aced-b7e50009-4f3bb889-250fa318@

Max-Forwards: 70

Date: Fri, 27 Sep 2013 10:40:56 GMT

CSeq: 101 INVITE

User-Agent: Cisco-CP8945/9.3.1

Contact: <56843CB8-C72D-7A41-B61A-020C56C6792B>;video

Expires: 180

Accept: application/sdp


Remote-Party-ID: "5007" <5007>;party=calling;id-type=subscriber;privacy=off;screen=yes

Supported: replaces,join,sdp-anat,norefersub,resource-priority,extended-refer,X-cisco-callinfo,X-cisco-serviceuri,X-cisco-escapecodes,X-cisco-service-control,X-cisco-srtp-fallback,X-cisco-monrec,X-cisco-config,X-cisco-sis-6.0.0,X-cisco-xsi-8.5.1

Allow-Events: kpml,dialog

Content-Length: 948

Content-Type: application/sdp

Content-Disposition: session;handling=optional


o=Cisco-SIPUA 23994 0 IN IP4

s=SIP Call

t=0 0

m=audio 16388 RTP/AVP 0 8 18 102 9 116 101

c=IN IP4

a=rtpmap:0 PCMU/8000

a=rtpmap:8 PCMA/8000

a=rtpmap:18 G729/8000

a=fmtp:18 annexb=no

a=rtpmap:102 L16/16000

a=rtpmap:9 G722/8000

a=rtpmap:116 iLBC/8000

a=fmtp:116 mode=20

a=rtpmap:101 telephone-event/8000

a=fmtp:101 0-15


m=video 16390 RTP/AVP 126 97

c=IN IP4


a=rtpmap:126 H264/90000

a=fmtp:126 profile-level-id=428014;packetization-mode=1;level-asymmetry-allowed=1;max-mbps=36000;max-fs=1200;max-rcmd-nalu-size=1300

a=imageattr:126 send [x=640,y=480] [x=640,y=360] [x=352,y=288] [x=176,y=144] recv [x=640,y=480]

a=rtpmap:97 H264/90000

a=fmtp:97 profile-level-id=428014;packetization-mode=0;level-asymmetry-allowed=1;max-mbps=36000;max-fs=1200

a=imageattr:97 send [x=640,y=480] [x=640,y=360] [x=352,y=288] [x=176,y=144] recv [x=640,y=480]


I have no way to change rtp payload type on the third-party device.

May be it is possible to change payload type on the side of CUCM for example using SIP Normalization Scrip?

Also logs from CUCM in attachment.

Thank you in advance!

Hall of Fame Super Gold

How to change RTP Payload Type in CUCM

I'm not sure. You can post in "IP telephony or even Video". You can move your posting with the Actions panel on the right.

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