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?