You might want to report this issue in the JIRA as a feature request. Iirc it doesn't support that yet. On Jul 24, 2012 6:26 AM, "Martyn Davies" <martyn@magiccow.co.uk> wrote:

I have an iSAC client that I'm testing against FreeSwitch.

Currently I have my vars.xml with:

global_codec_prefs=isac,PCMU,PCMA,GSM,G722

Which works, but only if the client specifies 32kHz mode. I want to test 16kHz mode, but FreeSwitch returns 'not acceptable here', and I can see that when Freeswitch offers iSAC in the SDP it says only isac/32000.

So how to enable 16kHz mode for isac?

I tried explicitly putting isac@320000h30i, isac@16000h30i into vars.xml, but this simply stops FreeSwitch from accepting anything.

Hints gladly received.

Regards, Martyn

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