[asterisk-bugs] [JIRA] (ASTERISK-26911) chan_sip should test case-insensitive for occurence of "RTP/AVP" in SDP RTP profile

[Asterisk Team (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-26911?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=236217#comment-236217 ] 

Asterisk Team commented on ASTERISK-26911:
------------------------------------------

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> chan_sip should test case-insensitive for occurence of "RTP/AVP" in SDP RTP profile
> -----------------------------------------------------------------------------------
>
>                 Key: ASTERISK-26911
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-26911
>             Project: Asterisk
>          Issue Type: Improvement
>      Security Level: None
>          Components: Channels/chan_sip/CodecHandling
>    Affects Versions: 11.25.1, 12.8.2, 13.11.2, 13.14.0, 14.3.0
>            Reporter: mgrobecker
>            Severity: Minor
>
> There are PBXes outside which are sending SDP offers with lowercase strings in the protocol description.
> Example from Swyx:
> -----------------------
> v=0
> o=- 3699694938 3699694939 IN IP4 192.168.0.10
> s=pjmedia
> c=IN IP4 192.168.0.10
> b=AS:84
> t=0 0
> a=X-nat:0
> m=audio 15028 rtp/avp 8 101
> b=TIAS:64000
> a=rtcp:50013 IN IP4 192.168.0.10
> a=sendrecv
> a=rtpmap:8 PCMA/8000
> a=rtpmap:101 telephone-event/8000
> a=fmtp:101 0-16
> -----------------------
> With "m=audio 15028 rtp/avp 8 101" in lowercase letters, Asterisk is unable to use this offer:
> -----------------------
> chan_sip.c:10353 process_sdp: Unknown RTP profile in audio offer: audio 15028 rtp/avp 8 101
> -----------------------
> This is because Asterisk is using "strcmp" in process_sdp() and is checking against an uppercase "RTP/AVP" only.
> The corresponding RFC 4317 (page 7) states, that the value of an SDP element is considered case-sensitive, so IMHO Asterisk is not behaving wrong at this point.
> But it would be a compatibility improvement at a low cost when searching for "RTP/AVP" case-insensitive with "strcasecmp".



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