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

[Kevin Harwell (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-27351?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=239687#comment-239687 ] 

Kevin Harwell commented on ASTERISK-27351:
------------------------------------------

A note to whomever looks more into/works this issue:

If it does turn out that the framing for ilbc can be configured and modified then please update the following wiki page to reflect that:

https://wiki.asterisk.org/wiki/display/AST/RTP+Packetization

> 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
>            Assignee: Unassigned
>            Severity: Minor
>         Attachments: one-way-20-20-ast20.pcap, one-way-matched-30-30-ast20.pcap, pjsip.conf.txt, two-way-30-30-ast20.pcap, two-way-mismatched-20-30-ast20.pcap
>
>
> 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-matched-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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