Hello All, I have a weird situation where a carrier is sending calls to our FS server but not hearing a Ringback tone, however once the call connects they are getting audio but when this carrier sends calls to our Yate server they are getting the Ringback without a problem. I have tried setting the Ring_Ready below but it didn't help the situation either. <extension name="ringback" continue="true"> <condition field="network_addr" expression="^(.*)$"> <action application="ring_ready"/> </condition> </extension> The traces from both the FS server and the Yate server show we are sending: 100 Trying 180 Ringing 183 Session Progress with SDP The carrier is claiming they are using the same configuration for both the Yate and FS server. Has anyone had similar a similar issue with Nextone (Genband)? Just to mention we are sending calls to this carrier from FS without issue. Thanks in advance, Errol