EFR and/or AMR codec with Osmo-BSC/SIP-connector/Asterisk

Dear list,

I managed to set up my E1 based Nokia BTS, the complete Osmo-CNI stack, SIP-connector and Asterisk. MO/MT calls do work as well as external SIP calls to and from mobile as well. But no matter what I do only plain FullRate calls are possible.

Under osmo-bsc.conf code support is set like this (the BTS HW do support all of these codecs): codec-support fr efr amr but once I also add "codec-list fr3 fr2 fr1" to the MSC section of the osmo-bsc.conf, the calls wont establish anymore.

I watched Neel's OsmoDevCall presentation on this topic, but it is not very clear what codecs are supported when osmo-sip-connector and an external PBX is used?

Regards, Csaba