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

[Johansson Olle E]

7 maj 2008 kl. 21.11 skrev Anthony Francis:

> andersen at mwdental.com wrote:
>> 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
>>
>>
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>>
> This is why Asterisk recommends dual registration. You reg with them  
> for
> out and the reg with you for in. :)
>

I would recommend that the service provider gives you all IP addresses  
they might send calls from, not dual registration.
Sending from a different IP if you are a service provider is unusual  
since so many customers have NATs that would stop all communication  
anyway.

/O