[SR-Users] fix_nated_sdp function

Ilie Soltanici iliusha.md at gmail.com
Tue Apr 6 17:19:35 CEST 2021


Hello,

Can someone point me to what is wrong with this SDP:

```
v=0 o=- 3826710256 3826710256 IN IP4 100.113.232.22 s=pjmedia b=AS:386 t=0
0 a=X-nat:0 m=audio 4012 RTP/SAVP 96 8 120 121 c=IN IP4 100.113.232.22
b=TIAS:96000 a=rtcp:4013 IN IP4 100.113.232.22 a=sendrecv a=rtpmap:96
opus/48000/2 a=fmtp:96 useinbandfec=1 a=rtpmap:8 PCMA/8000 a=rtpmap:120
telephone-event/48000 a=fmtp:120 0-16 a=rtpmap:121
telephone-event/8000 a=fmtp:121
0-16 a=ssrc:886437437 cname:61141a4c6ecaa55e a=crypto:1
AES_256_CM_HMAC_SHA1_80
inline:J9gds2sgq3OQccZ4fQoy3Oh9P2sWAXGHpLx+v/Ykh3gFQtAcaD8u5zpygEw2Dw==
a=crypto:2
AES_256_CM_HMAC_SHA1_32
inline:yVCi20viRSxW+7hkUDjDBfXX4eAsuNrGj96ByTpDejOww8A0+BwSDjO40U1u3A==
a=crypto:3
AES_CM_128_HMAC_SHA1_80
inline:9vWxWlHSBcLYv0p+qYTviva7Bc6tUb+fKblHaQ1D a=crypto:4
AES_CM_128_HMAC_SHA1_32 inline:UlLlQR2NB1owPDx7fFyGqnq09AVFVOLB50I3f/FC
```

I'm trying to apply function "fix_nated_sdp" to it, but getting back this
error:

<no `IP[4|6]' in `a=rtcp' field>

By looking at the source code, seems that the nextissip value is 0, and
that's why it fails (nextissip value:0/len:14)

Any idea why?
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