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Lua scripting on outgoing INVITE

Hi,

I am trying to remove all the video lines from an invite that is sent out via a sip trunk in cucm.

Here is my script

Before outbound SIP Normalization msg is:


v=0

o=CiscoSystemsCCM-SIP 12238799 2 IN IP4 10.47.6.33

s=SIP Call

b=TIAS:384000

b=AS:384

t=0 0

m=audio 17816 RTP/AVP 102 103 104 105 106 0 8 101

c=IN IP4 XXX.XXX.XXX.XXX

b=TIAS:64000

a=rtpmap:102 MP4A-LATM/90000

a=fmtp:102 bitrate=64000;profile-level-id=24;object=23

a=rtpmap:103 MP4A-LATM/90000

a=fmtp:103 bitrate=56000;profile-level-id=24;object=23

a=rtpmap:104 MP4A-LATM/90000

a=fmtp:104 bitrate=48000;profile-level-id=24;object=23

a=rtpmap:105 G7221/16000

a=fmtp:105 bitrate=32000

a=rtpmap:106 G7221/16000

a=fmtp:106 bitrate=24000

a=rtpmap:0 PCMU/8000

a=ptime:20

a=rtpmap:8 PCMA/8000

a=ptime:20

a=rtpmap:101 telephone-event/8000

a=fmtp:101 0-15

m=video 17818 RTP/AVP 97 98 99 34 31

c=IN IP4 XXX.XXX.XXX.XXX

b=TIAS:384000

a=label:11

a=rtpmap:97 H264/90000

a=fmtp:97 profile-level-id=428016;max-mbps=108000;max-fs=3600;max-cpb=200;max-br=5000;max-smbps=108000;max-fps=6000

a=rtpmap:98 H264/90000

a=fmtp:98 profile-level-id=428016;packetization-mode=1;max-mbps=108000;max-fs=3600;max-cpb=200;max-br=5000;max-smbps=108000;max-fps=6000

a=rtpmap:99 H263-1998/90000

a=fmtp:99 QCIF=1;CIF=1;CIF4=1;MAXBR=3840;CUSTOM=352,240,1

a=rtpmap:34 H263/90000

a=fmtp:34 QCIF=1;CIF=1;CIF4=1;MAXBR=3840

a=rtpmap:31 H261/90000

a=fmtp:31 CIF=1;QCIF=1;MAXBR=3840

a=content:main

a=rtcp-fb:* nack pli

a=rtcp-fb:* ccm fir

m=video 17820 RTP/AVP 97 98 99 34 31

c=IN IP4 XXX.XXX.XXX.XXX

b=TIAS:384000

a=label:12

a=rtpmap:97 H264/90000

a=fmtp:97 profile-level-id=428016;max-mbps=108000;max-fs=3840;max-cpb=200;max-br=5000;max-smbps=108000;max-fps=6000

a=rtpmap:98 H264/90000

a=fmtp:98 profile-level-id=428016;packetization-mode=1;max-mbps=108000;max-fs=3840;max-cpb=200;max-br=5000;max-smbps=108000;max-fps=6000

a=rtpmap:99 H263-1998/90000

a=fmtp:99 QCIF=1;CIF=1;CIF4=1;MAXBR=3840;CUSTOM=352,240,1

a=rtpmap:34 H263/90000

a=fmtp:34 QCIF=1;CIF=1;CIF4=1;MAXBR=3840

a=rtpmap:31 H261/90000

a=fmtp:31 CIF=1;QCIF=1;MAXBR=3840

a=content:slides

a=rtcp-fb:* nack pli

a=rtcp-fb:* ccm fir

m=application 17822 RTP/AVP 107

c=IN IP4 XXX.XXX.XXX.XXX

a=rtpmap:107 H224/0

After normalization it is

v=0

o=CiscoSystemsCCM-SIP 12238799 2 IN IP4 10.47.6.33

s=SIP Call

b=TIAS:384000

b=AS:384

t=0 0

m=audio 17816 RTP/AVP 102 103 104 105 106 0 8 101

c=IN IP4 XXX.XXX.XXX.XXX

b=TIAS:64000

a=rtpmap:102 MP4A-LATM/90000

a=fmtp:102 bitrate=64000;profile-level-id=24;object=23

a=rtpmap:103 MP4A-LATM/90000

a=fmtp:103 bitrate=56000;profile-level-id=24;object=23

a=rtpmap:104 MP4A-LATM/90000

a=fmtp:104 bitrate=48000;profile-level-id=24;object=23

a=rtpmap:105 G7221/16000

a=fmtp:105 bitrate=32000

a=rtpmap:106 G7221/16000

a=fmtp:106 bitrate=24000

a=rtpmap:0 PCMU/8000

a=ptime:20

a=rtpmap:8 PCMA/8000

a=ptime:20

a=rtpmap:101 telephone-event/8000

a=fmtp:101 0-15

m=video 17820 RTP/AVP 97 98 99 34 31

c=IN IP4 XXX.XXX.XXX.XXX

b=TIAS:384000

a=label:12

a=rtpmap:97 H264/90000

a=fmtp:97 profile-level-id=428016;max-mbps=108000;max-fs=3840;max-cpb=200;max-br=5000;max-smbps=108000;max-fps=6000

a=rtpmap:98 H264/90000

a=fmtp:98 profile-level-id=428016;packetization-mode=1;max-mbps=108000;max-fs=3840;max-cpb=200;max-br=5000;max-smbps=108000;max-fps=6000

a=rtpmap:99 H263-1998/90000

a=fmtp:99 QCIF=1;CIF=1;CIF4=1;MAXBR=3840;CUSTOM=352,240,1

a=rtpmap:34 H263/90000

a=fmtp:34 QCIF=1;CIF=1;CIF4=1;MAXBR=3840

a=rtpmap:31 H261/90000

a=fmtp:31 CIF=1;QCIF=1;MAXBR=3840

a=content:slides

a=rtcp-fb:* nack pli

a=rtcp-fb:* ccm fir

The script is the following

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

M = {}

function M.outbound_INVITE(msg)

    local sdp = msg:getSdp()

    if sdp

    then

    local video = {}

    for i=2,4 do

            video[i] = sdp:getMediaDescription(i)

            if video[i]

            then

                --remove the video media description

                sdp = sdp:removeMediaDescription(i)

                --set the modified sdp

        msg:setSdp(sdp)

        end

    end

    end 

end

return M

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

Can somebody tell me what is wrong with the script ?

The output of the cucm does not make sense to me

1 ACCEPTED SOLUTION

Accepted Solutions

Thanks for the reply. I actually wanted to strip all the m lines after the audio line (lines 2, 3 etc )

What callmanager was doind was actually correct. I was stripping the lines from top to bottom (2, 3 etc) while i had to go from bottom to top. So a loop with a negative step did the trick

But it is true maybe I don't need a table after all. Will check that to be sure

Regards,

Christos

View solution in original post

2 REPLIES 2
Mark Stover
Cisco Employee

I'm not sure why you made 'video' a table, it could be the source of your problems. just make video a string, then set

video = "" each time through the loop.

If you only care about the first media description, you could also just get it and set SDP to contain only that instead of removing one line at a time.

Thanks for the reply. I actually wanted to strip all the m lines after the audio line (lines 2, 3 etc )

What callmanager was doind was actually correct. I was stripping the lines from top to bottom (2, 3 etc) while i had to go from bottom to top. So a loop with a negative step did the trick

But it is true maybe I don't need a table after all. Will check that to be sure

Regards,

Christos

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