The SIP connector is still being incorrectly assigned the PCMU codec. 

Omar, a quick and dirty hack for the osmo-sip-connector, to (probably) get your calls running through FreeSwitch:

Hardcode override the pt in sdp_create_file() in sdp.c by adding

other->payload_type = 98; (or for full rate GSM, it would be other->payload_type = 3;)

somewhere in the top of that function,

at line 170 for example, here: http://git.osmocom.org/osmo-sip-connector/tree/src/sdp.c#n170)

k/