Hey Guys, I've done a fair bit of research, but have been unable to locate anything detailing how to get the Music On Hold working. I've setup a system as per the guide here: http://kb.asipto.com/asterisk:realtime:kamailio-4.0.x-asterisk-11.3.0-astdb These features work well - Sip to sip, nat traversal, inbound and outbound calls using asterisk as the gateway. Transfers both blind and assisted etc. The only feature I have found so far to not work is Music on hold. Happy to supply Sip trace & RTP Stream is required, but I assume this is a common issue as I don't see any support in the kamailio config script. Thanks in advance for your assistance Dave _______________________________________________ SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list sr-users(a)lists.sip-router.org http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users