А если вот так?
Dropping incompatible voice frame on SIP/SIP-PROVIDER-207726573153c521a09a42b-00000677 of format alaw since our native format has changed to (ulaw)
Dropping incompatible voice frame on SIP/SIP-PROVIDER-207726573153c521a09a42b-00000677 of format ulaw since our native format has changed to (alaw)
Dropping incompatible voice frame on SIP/SIP-PROVIDER-207726573153c521a09a42b-00000677 of format alaw since our native format has changed to (ulaw)
Dropping incompatible voice frame on SIP/SIP-PROVIDER-207726573153c521a09a42b-00000677 of format ulaw since our native format has changed to (alaw)