Hello All! Strange problem! This is my sip.conf :- [general] port = 5060 ; Port to bind to (SIP is 5060) bindaddr = 0.0.0.0 ; Address to bind to (all addresses on machine) disallow=all ;allow=g723 allow=g729 allow=ulaw allow=alaw externip=xxx.xxx.xxx.xxx localnet=192.168.0.254 localmask=255.255.255.0 nat=yes context = from-sip-external ; Send unknown SIP callers to this context callerid = Unknown #include sip_nat.conf #include sip_additional.conf Just listed the codec priorities and now voicemail and conference bridge are not working. All my Snom phones are with Codec g729... I tested with X-Lite which is G711 and still... I had this problem earlier also, I thought it was some config I messed up and reinstalled but it happened again... Any Idea? And how can I unregister users from the asterisk command line. Any help would be appreciated. Nitesh