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...odecs. The issue is then: When an incoming call comes in, a codec is negotiated (usually ULAW), later on, when the extension is dialed, we'll see we're doing GSM, and thus transcode. Here's an example dialplan: [incoming] exten => 123,1,Dial(IAX2/gsmUser) exten => 456,2,Dial(IAX2/ilbcUser) exten => 789,3,Dial(IAX2/g729User) You're pretty much forced to accept ULAW, and then transcode. Not fun if your provider does it for you (that's what you pay them for, right?). So, with this patch, just add a new config file. codec_passthrough.conf: [iax_my-did-provider] 123=gsm 456...