[asterisk-users] How to handle multiple IPs from one SIP carrier

[andersen at mwdental.com]

On my SIP carrier, I register to a proxy "sipconnect.dal0.cbeyond.net"
which ends up being 192.168.22.212 (They supply a T1 bundle)

#sip show peers
Name/username              Host            Dyn Nat ACL Port     Status
<snip>
Generic-8174691929/817469  192.168.22.212       N      5060     OK (41 ms)

Yesterday, they had a problem with their primary server and reverted
to a backup server for about 5 minutes.  As chance would have it, I
received a call to one of my DIDs just before and just after the switch.
As you can see below, the first call was on their primary server and
the "Found peer" finds the Generic-8174691929 peer I have set up.

Using INVITE request as basis request -
BW124119297070508-1055880459 at bwas1-vir.atl0.cbeyond.net
Sending to 192.168.22.212 : 5060 (NAT)
Found peer 'Generic-8174691929'   <<<<<<<<<<<<<<<<<<<<
Found RTP audio format 0
Found RTP audio format 100

However, just after they changed to the backup service, I received the
call below.

Using INVITE request as basis request -
BW112003982070508-1664258428 at bwas2-vir.dal0.cbeyond.net
Sending to 192.168.25.212 : 5060 (NAT)
Found no matching peer or user for '192.168.25.212:5060'   <<<<<<<<<<<<
Found RTP audio format 0
Found RTP audio format 100

Since it was a different IP address, it found no matching peer
and failed to find a valid context to send the call to.

How should this be addressed in Asterisk to allow for such an incident?

Bill