Had the error of below when using the VOIP with Asterisk 11.17.1. No audio during the call. Never has this issue until recent.
Error message: res_rtp_asterisk.c: Unknown RTP codec 95 received from xx.xx.xx.xx
Zoiper Version 1.45. Library version v2.8.15.
Enabled codecs on Zoiper: gsm, u-law and a-law. These codecs are supported on the Asterisk and SIP hard phones have no issue with the same PBX.