Hi, I have an Asterisk installation (latest CVS version with channel.c.diff patch) that connects to a SIP Provider. Client is a BudgeTone-100. SIP Provider <-> * Server <-> NAT Firewall (Linksys) <-> BT100 Outbound calls work perfect. With Inbound calls the BT rings but I don?t hear the caller and he doesn?t hear me. BT config: local SIP port:5060 local RTP port:5004 use random port: no NAT Traversal: yes, no stun server (but have also tried with stun server) This is the corresponding entry in sip.conf ... [mike] type=friend username=mike secret=fish reinvite=no canreinvite=no host=dynamic dtmfmode=rfc2833 nat=yes qualify=yes disallow=all allow=ulaw allow=alaw If I connect the BT directly to the SIP Provider there are no problems. Any ideas what I should try? TIA, Mike