[Freeswitch-users] Painted into a corner: outbound-codec-prefs, late negotiation, and inherit codec

[Jeremy Childs]

A quick introduction to what I'm trying to do:

I have two SIP profiles, "internal" (port 5060) and "offpremise" (port 
5070). Both of these profiles are recording registrations to the same 
registration db, so they can be reached by user/nnn. When a device 
leaves the local LAN and heads out into the field, firewall port 
translation maps port 5060 to 5070, so FS "knows" the extension is now 
off-premise.

All profiles on the box are set to inbound-late-negotiation and 
inherit-codec, to reduce transcoding.

What I would like to do is set a very restrictive list of codecs on the 
"offpremise" profile, so that an exension registered to "offpremise" 
only sees a set of low-bandwidth codecs. To facilitate this, I have set 
outbound-codec-prefs on the profile.

After much testing, I have determined that "outbound-codec-prefs" in 
this configuration ends up ADDING codecs to the offer, and will not 
remove any codecs offered by the A-leg. Interestingly, 
inbound-codec-prefs seems to remove codec from the A-leg offer.

So, my question: is there any way of restricting the list of codecs 
offered on the B-leg using the profile configuration (and not from 
within the dialplan)? If there is any answer at all, I'd suspect it's 
one of the following:

  * a global setting that changes the behavior of outbound-codec-prefs
    to be restrictive, instead of additive (the source doesn't seem to
    suggest this)
  * a way to set absolute_codec_string (or other variables) from within
    the profile itself
  * a way to set a variable (again, likely absolute_code_string) to the
    registration instance so the codec list can be explicitly specified
  * any other far-out ideas for accomplishing this kind of seamless
    "roaming"

Any ideas or hints greatly appreciated.

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