[asterisk-bugs] [JIRA] (ASTERISK-27351) iLBC Codec Mismatch

[Asterisk Team (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-27351?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=239378#comment-239378 ] 

Asterisk Team commented on ASTERISK-27351:
------------------------------------------

Thanks for creating a report! The issue has entered the triage process. That means the issue will wait in this status until a Bug Marshal has an opportunity to review the issue. Once the issue has been reviewed you will receive comments regarding the next steps towards resolution.

A good first step is for you to review the [Asterisk Issue Guidelines|https://wiki.asterisk.org/wiki/display/AST/Asterisk+Issue+Guidelines] if you haven't already. The guidelines detail what is expected from an Asterisk issue report.

Then, if you are submitting a patch, please review the [Patch Contribution Process|https://wiki.asterisk.org/wiki/display/AST/Patch+Contribution+Process].

> iLBC Codec Mismatch
> -------------------
>
>                 Key: ASTERISK-27351
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-27351
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>    Affects Versions: 15.0.0
>         Environment: x64 CentOS
>            Reporter: Luke Escude
>
> Asterisk, when set to use iLBC, has 2 issues:
> 1. The INVITE SDP from Asterisk always contains 20ms frame size, regardless if ilbc is set in asterisk as ilbc:30 or ilbc:20
> 2. Asterisk always sends 30ms frames regardless of what was negotiated/set in pjsip.conf
> Attached are 4 packet captures:
> one-way-match-30-30-ast20.pcap is a one-way audio example where Asterisk is configured to use ilbc:30, but offers 20 in the SDP, and the phone uses 20.
> two-way-mismatched-20-30-ast20.pcap is a two-way audio example where Asterisk is configured to use ilbc:30, but offers 20 in the SDP, and the phone uses 30 (therefore, 2-way audio).
> Two-way-30-30-ast20.pcap is a two-way audio example where Asterisk is configured to use ilbc:30, but offers 20 in the SDP, and the phone uses 30, (therefore, 2-way audio)
> One-way-20-20-ast20.pcap is a one-way audio example where Asterisk is configured to use ilbc:20, offers 20 in the SDP, and phone is configured to use 20 (but it's still one-way audio because Asterisk is actually sending 30).
> Let me know if you need me to do more testing, it's 100% repeatable. 



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