Re: [EXTERNAL] Attempt to remove unwanted media streams has no effect

Do you have something else in your Kamailio config that makes any 
changes to the SDP (rtpengine being the usual suspect)?

On 17/04/2026 16.28, David Villasmil via sr-users wrote:
> Hello all,
>
> It's been a while!
>
> I'm receiving from freeswitch an INVITE with both RTP/AVP and 
> RTP/SAVP. Providers don0t like this, they want to see a single audio 
> stream offer, and i want to remove the non-supported stream on 
> kamailio, since i have to mix and match on failover.
>
> I see kamailio attempting to remove the streams but it has no effect 
> whatsoever, you'll see below enumerating the streams to remove, but 
> doesn't actually removes them... (i didn't print out the SDP, it's 
> done by the module, so it should be ok, furthermore that's what i see 
> being forwarded):
>
> ```
>  5(13) DEBUG: INVITE <null> 1.2.3.4:5080 <http://1.2.3.4:5080> 
> 59bb066c-b53d-123f-47b3-1228f25c4047 sdpops [sdpops_mod.c:1374]: 
> sdp_remove_transport(): attempting to search for transport type: [RTP/AVP]
>  5(13) DEBUG: INVITE <null> 1.2.3.4:5080 <http://1.2.3.4:5080> 
> 59bb066c-b53d-123f-47b3-1228f25c4047 sdpops [sdpops_mod.c:1390]: 
> sdp_remove_transport(): stream 0 of 0 - transport [RTP/SAVP]
>  5(13) DEBUG: INVITE <null> 1.2.3.4:5080 <http://1.2.3.4:5080> 
> 59bb066c-b53d-123f-47b3-1228f25c4047 sdpops [sdpops_mod.c:1390]: 
> sdp_remove_transport(): stream 1 of 0 - transport [RTP/AVP]
>  5(13) DEBUG: INVITE <null> 1.2.3.4:5080 <http://1.2.3.4:5080> 
> 59bb066c-b53d-123f-47b3-1228f25c4047 sdpops [sdpops_mod.c:1398]: 
> sdp_remove_transport(): removing transport stream: RTP/AVP 5(13) 
> DEBUG: INVITE <null> 1.2.3.4:5080 <http://1.2.3.4:5080> 
> 59bb066c-b53d-123f-47b3-1228f25c4047 sdpops [sdpops_mod.c:1390]: 
> sdp_remove_transport(): stream 2 of 0 - transport [RTP/SAVP]
>  5(13) DEBUG: INVITE <null> 1.2.3.4:5080 <http://1.2.3.4:5080> 
> 59bb066c-b53d-123f-47b3-1228f25c4047 sdpops [sdpops_mod.c:1390]: 
> sdp_remove_transport(): stream 3 of 0 - transport [RTP/AVP]
>  5(13) DEBUG: INVITE <null> 1.2.3.4:5080 <http://1.2.3.4:5080> 
> 59bb066c-b53d-123f-47b3-1228f25c4047 sdpops [sdpops_mod.c:1398]: 
> sdp_remove_transport(): removing transport stream: RTP/AVP 5(13) 
> DEBUG: INVITE <null> 1.2.3.4:5080 <http://1.2.3.4:5080> 
> 59bb066c-b53d-123f-47b3-1228f25c4047 textops [textops.c:2524]: 
> ki_set_body(): new body: [v=0
> o=FreeSWITCH 1776432039 1776432040 IN IP4 1.2.3.4
> s=FreeSWITCH
> c=IN IP4 1.2.3.4
> t=0 0
> m=audio 25032 RTP/SAVP 0 8 101 13
> a=rtpmap:0 PCMU/8000
> a=rtpmap:8 PCMA/8000
> a=rtpmap:101 telephone-event/8000
> a=fmtp:101 0-15
> a=rtpmap:13 CN/8000
> a=crypto:1 AEAD_AES_256_GCM_8 
> inline:SJqvkk2FLvI0tOHPkn7Ac8TkrADNB7buSM6h9ZTBZHHh1OV9uOkGV1DF1DU=
> a=crypto:2 AEAD_AES_256_GCM 
> inline:jnzCFpgWPjCIAz13r3vCfqbGzxE1x30DJl/0xOVWWS1m34Ka+dD1c45GQX4=
> a=crypto:3 AEAD_AES_128_GCM_8 
> inline:B4mysNibq+BH01ASVvceC7g69HmZUHrYtMVmDA==
> a=crypto:4 AEAD_AES_128_GCM 
> inline:NLVvi1aEW+oWM+AQtV/5hKgMR274BscLBZAJRw==
> a=crypto:5 AES_256_CM_HMAC_SHA1_80 
> inline:eE3dGn207RnrLSeeTvSP05vUnQax7jATdiizGrVS9mxJQo/pcvvMlhoJdSYT+w==
> a=crypto:6 AES_192_CM_HMAC_SHA1_80 
> inline:VDveo9syEdOzxaIn9dpcMfG5ygdOv68yCpAnYwA8f0YlY51lElk=
> a=crypto:7 AES_CM_128_HMAC_SHA1_80 
> inline:8025UxyTFme6casTeasbrPYUt/ta2yoZGlQFvags
> a=crypto:8 AES_256_CM_HMAC_SHA1_32 
> inline:Ux9cBuGGe1Ft8knU7ZeWqnrOETHIqmVGjOTdi78GesXti6wO1ud0gvneW2JT+Q==
> a=crypto:9 AES_192_CM_HMAC_SHA1_32 
> inline:kxmHW+oXsu0NuCOwW3uXRmlMAgT1+2GUZjK2ExPC8sD2Xckonms=
> a=crypto:10 AES_CM_128_HMAC_SHA1_32 
> inline:MigohPAYbhU2QbJCRN6UUXcKIRAdhFur6EMDAziM
> a=crypto:11 AES_CM_128_NULL_AUTH 
> inline:R9Aw9RUizWe8r07U8oV02fU+nQ4FkGmkhGflcoPY
> a=ptime:20
> m=audio 25032 RTP/AVP 0 8 101 13
> a=rtpmap:0 PCMU/8000
> a=rtpmap:8 PCMA/8000
> a=rtpmap:101 telephone-event/8000
> a=fmtp:101 0-15
> a=rtpmap:13 CN/8000
> a=ptime:20
> m=video 23724 RTP/SAVP 102
> b=AS:1024
> a=rtpmap:102 VP8/90000
> a=rtcp-fb:102 ccm fir
> a=rtcp-fb:102 ccm tmmbr
> a=rtcp-fb:102 nack
> a=rtcp-fb:102 nack pli
> a=crypto:1 AEAD_AES_256_GCM_8 
> inline:EzIhXMiY/IU6pwGdiwIGs43YlIoBYrNyiK8XR1lc3auF3qf2GNCIrADZh8k=
> a=crypto:2 AEAD_AES_256_GCM 
> inline:rSsEBQWi3qlC6nOcYD+xoz8Ux2dlPZDFf2zUOKR6XREkwvbExgQp1RCOjsQ=
> a=crypto:3 AEAD_AES_128_GCM_8 
> inline:nwMmmSlFJjhgrqCujnsXV2nFsCBpmkeZ9y5FMA==
> a=crypto:4 AEAD_AES_128_GCM 
> inline:bAWJtV65VMLHXVvfHwbgwBEYa5Fqi0t9DCB2zg==
> a=crypto:5 AES_256_CM_HMAC_SHA1_80 
> inline:5m+7Gpqd1AIK8gEAMwti3yrS/cf5ig75Z9OSAAnjT6X8fDG9rBnYVZu0n9pyWg==
> a=crypto:6 AES_192_CM_HMAC_SHA1_80 
> inline:zbzJ7sGdUdytETroy6Txg4YU/qBjl1/JKR7VadHx8y61tfTfEaA=
> a=crypto:7 AES_CM_128_HMAC_SHA1_80 
> inline:5UiBkGVL9s/CjGIb3SPODZkTwJcfCipkiGZH4KI6
> a=crypto:8 AES_256_CM_HMAC_SHA1_32 
> inline:KzBizz3SfxkK8n3MRvA70hCT9X95imVZldDAWzeHEjobSzzEGbAyc7YCZFYE1g==
> a=crypto:9 AES_192_CM_HMAC_SHA1_32 
> inline:hwSaAGg6n6loiNLIqg30ZAVaor5pm/ds8Llf2ti95pYR2kGPG3Y=
> a=crypto:10 AES_CM_128_HMAC_SHA1_32 
> inline:3/cf0KoXXso4L3+vpL95iBe3Nnu+QGdZxIDC1ulq
> a=crypto:11 AES_CM_128_NULL_AUTH 
> inline:61izsKf/RCgzBtsNAAiTe+3w1sW/8GP6oET7cWcK
> m=video 23724 RTP/AVP 102
> b=AS:1024
> a=rtpmap:102 VP8/90000
> a=rtcp-fb:102 ccm fir
> a=rtcp-fb:102 ccm tmmbr
> a=rtcp-fb:102 nack
> a=rtcp-fb:102 nack pli
> ]
> ```
> Any help is greatly appreciated, thanks!
>
> Regards,
>
> David Villasmil
> email: [email protected]
>
>
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