I have a Asterisk SVR in my LAN and which is up & running. it is mapped to a public address by configuring a Static NAT in my Cisco 805 router.
All my sip phones in the LAN is working without aproblem within the LAN, voice quality is also good. But in the WAN (Beyond my router) the SIP phones are even registered with my Asterisk SVR without any problem, you can ring each other, But when you pick the phone there’s no voice is coming in both sides. Also the ring-back tone could only be only hear from the SIP phone side only.
Here’s my specific places of SIP.conf file.
Please help me to solve this problem.
context=sip_tute ;My Default context for incoming calls
bindaddr=0.0.0.0 ; IP address to bind to (0.0.0.0 binds to all)
;When Asterisk is in behind a NAT
externip = xx.xx.xx.xx. ;//Our router’s serial interface
; Address that we’re going to put in outbound SIP messages