Voxalot / SIP Broker Support Forums - Controlling Codec selection

I can't seem to get VoXaLot to do my bidding with regard to the Codecs... (Using au.voxalot.com)

I have set the Codec for each of the 3 providers to g729 only. I am using a SNOM 320 phone and set the Codec order to G729, GSM, G723, ALaw, ULaw. The resulting Invite contains the following:

Code:

m=audio 49156 RTP/AVP 18 3 4 8 0 101

a=rtpmap:18 g729/8000

a=rtpmap:3 gsm/8000

a=rtpmap:4 g723/8000

a=rtpmap:8 pcma/8000

a=rtpmap:0 pcmu/8000

a=rtpmap:101 telephone-event/8000

a=fmtp:101 0-16

a=ptime:20

a=sendrecv

The 183 Session Progress and 200 OK messages coming back from Voxalot have:

Code:

m=audio 19650 RTP/AVP 0 8 18 3 101

a=rtpmap:0 PCMU/8000

a=rtpmap:8 PCMA/8000

a=rtpmap:18 G729/8000

a=fmtp:18 annexb=no

a=rtpmap:3 GSM/8000

a=rtpmap:101 telephone-event/8000

a=fmtp:101 0-16

a=silenceSupp:off - - - -

The resulting conversation is using ulaw. How do I stop this behaviour?

Sure I could remove the offending codecs from my list on the phone but it would be better if Voxalot respected the order of selection I made in the first place especially since I have removed all other codecs from the providers setup.