[sr-dev] [kamailio/kamailio] Rfc3264 on session (#2813)

[lazedo]

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#### Type Of Change
- [X] Small bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds new functionality)
- [ ] Breaking change (fix or feature that would change existing functionality)

#### Checklist:
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- [X] PR should be backported to stable branches
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#### Description
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some user agents send a=sendonly as a session attribute and is_audio_on_hold() returns false when it should return true.

#### Changes
- changed sdp_session_cell struct in sdp.h to add sendrecv_mode and is_on_hold
- changed parse_sdp_session in sdp.c to iterate session attributes and call extract_sendrecv_mode for assigment to session
- changed ki_is_audio_on_hold in textops.c to look for session sendrecv_mode if its not set in media




You can view, comment on, or merge this pull request online at:

  https://github.com/kamailio/kamailio/pull/2813

-- Commit Summary --

  * core: parse session sendrecv_mode in sdp
  * textops: check session sendrecv_mode in is_audio_on_hold

-- File Changes --

    M src/core/parser/sdp/sdp.c (12)
    M src/core/parser/sdp/sdp.h (2)
    M src/modules/textops/textops.c (7)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/2813.patch
https://github.com/kamailio/kamailio/pull/2813.diff

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