How to set up a second service as fail over?

Asterisk Asterisk General
1

I have two sip service providers. I usually use make calls use the first one (72202). I want to use localphone as back up in case the registration to first one fails. The two statements I used are given below:

exten => _1NXXNXXXXXX,1,Dial(SIP/${EXTEN}@72202,20,tr)
same => n,Dial(SIP/${EXTEN}@localphone,30,tr)

In case the registration to 72202 fails, local phone will take over after 20 seconds (time out). My question is: is there any way that Asterisk would detect the registration to 72202 is not available so it will failover immediately? Thanks.

2

If the first phone is unregistered, and dynamic, it will fall through immediately. For static addresses, you can use qualify to detect the loss.

3

Thanks for your reply. But I was not talking about a phone registered to my asterisk. My asterisk is registered to another server 72202. If the second server is offline, I don’t know how my asterisk can detect this and make call through Localphone immediately. Is it possible to qualify a registration to a server as you said?

4

Enable qualify. When the qualify fails, the Dial will start to fall through promptly.

5

I understand now and made it work. Thanks.