i am using linux fc5 and it could be a firewall issue. as far as the isp, all ports are open. i use the same isp to register my asterisk system and linksys with voip providers. the problem is when other sip clients try to register to my asterisk system.
Regards;
CHawki
Added after 41 minutes:
when i do sip show peers it shows all the peer client that are created by a2billing and these should register with asterisk, but they are not. and a peer that are created in a sip.conf file and are registered with a voip provider.
sip peers show
Name/username Host Dyn Nat ACL Port Status
xxxxxx/xxxxxxx (Unspecified) D N 0 UNKNOWN
xxxxxxx/xxxxxxx (Unspecified) D N 0 UNKNOWN
xxxxxxx/xxxxxxx (Unspecified) D N 0 UNKNOWN
. . . . . .
. . . . . .
xxxxxxx/xxxxxxx xxx.xxx.xxx.xxx N 5060 Unmonitored
the first clients are the a2billing sip client and the last one is a voip provider account
sip registry only shows the peer registered with the voip provider:
voip provider:5060 xxxxx 585 Registered Sat, 15 Nov 2008 18:12:55
hope this give a clue
regards
chawki
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