[asterisk-bugs] [JIRA] (ASTERISK-28199) sdp: iLBC codec does not contain "mode=" attribute

[Alexander Traud (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-28199?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=252878#comment-252878 ] 

Alexander Traud commented on ASTERISK-28199:
--------------------------------------------

Are you still able to reproduce this with Asterisk 16 because Asterisk 13 receives [security fixes only|https://wiki.asterisk.org/wiki/display/AST/Asterisk+Versions]?

Anyway, it should have worked in Asterisk 13 because {{mode=30}} is the default. If that format parameter is absent, {{mode=30}} has to be assumed. Consequently, this is an issue in your SIP User Agents. Did you report to them? Nevertheless for Asterisk 13, the iLBC 20 support (which was added with Asterisk 14), can be [downloaded here…|https://github.com/traud/asterisk-ilbc] with that, {{mode=30}} is sent ‘always’. Does that help? If not, you can revert the fix/patch for ASTERISK-25309 and change {{mode=%u}} to {{mode=30}}.

> sdp: iLBC codec does not contain "mode=" attribute
> --------------------------------------------------
>
>                 Key: ASTERISK-28199
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-28199
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: Channels/chan_sip/CodecHandling, Codecs/codec_ilbc
>    Affects Versions: 13.23.1
>         Environment: Centos 6 32bit
> Kernel 2.6.32-642.6.2.el6.i686
>            Reporter: Ariel Grin
>            Assignee: Unassigned
>            Severity: Minor
>              Labels: pjsip
>         Attachments: sip_debug_peer_106.txt
>
>
> Hi all: I’m trying to use iLBC codec but I found that iLBC has a no audio issue. If both endpoints are using iLBC neither endpoint can hear the other, even though RTP packets are flowing correctly, as checked with rtp debug. Also if an echo test is performed on an endpoint with iLBC, neither the initial explanatory message nor the echo itself can be heard. If one endpoint is using iLBC and the other is using another codec, I tried with ulaw, g729 and g722, iLBC endpoint can’t hear the other non-iLBC endpoint, but non-iLBC endpoint can hear iLBC endpoint.
> This has been tested between internal extensions on a local LAN, no NAT involved. This issue only happens when one or both endpoints are using iLBC. There are no audio issues when using any other codec except iLBC.



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