[Asterisk-Users] Cisco ATA186/Asterisk registration - weird behavior

[Paul Cheng]

Hi,

I have two Cisco ATA186s that are set up to connect to an Asterisk box 
via SIP. One is on the local LAN and not natted, the other is on a 
remote LAN behind a NAT router. Both boxes are running v2.16 firmware. 
They can both register with the Asterisk box, but after they are idle 
for a while, either they or the Asterisk box "lose" the connection 
(i.e. stop being registered). Strangely enough, though, the Cisco that 
is on the LAN has two analog telephones connected to the ATA: x801 is 
Phone 1, x802 is Phone 2. x802 stays registered as verified with "sip 
show registry", but x801 does not (even though it is the same box!). 
Outbound calls can be placed from all 3 phones (only 1 phone is 
connected to the remote ATA), but only the extension that stays 
registered can receive inbound calls.

The Max Expiry is set to 60 and the Ciscos keep registering, but 
somewhere along the way, something is dropping on the registry. If I 
terminate Asterisk and restart, sometimes it resets. The only way to 
continually keep them registered is to kill Asterisk, power off the 
Ciscos and then restart Asterisk, and then power on the Ciscos.

Has anyone else seen behavior like this? I think I saw a post about 
Ciscos becoming unregistered after 2 hours--does anyone have any 
insights? Thanks in advance.