Hello dear friends,
i have one question on the subject described up. On 2821 router I have SIP to SIP connection to my ISP and we are planning to add on this router new ISDN card that will come active when the SIP connection goes down.
Can you please point me in the right way, give me an example how to do that. Is it possible to configure this in CUCM or has to be configured directly on the router?
So the question is how to make backup from SIP as primary connection to ISDN PRI(TDM) ?
Thank you realy for you help and time!
If you are using MGCP you should see the different endpoints. I am not sure but you should see the sip to sip, and the pri interface.
So you can put each into a distintc route group.
Then you could add a new route list. In route list you can add several route groups, and give them an order (so sip to sip should be first and pri at last).
Then you can use this route list in your route patterns for outgoing calls.
To give specific dial peers in the pool a preference over other dial peers, you can configure the preference order for each dial peer by using the preference command. The router attempts to place a call to the dial peer with the highest preference. The configuration example given for Router B shows that all dial peers have the same destination pattern, but different preference orders.
Here is some extract form "Dial Peer Configuration on Voice Gateway Routers"
"The lower the preference number, the higher the priority. The highest priority is given to the dial peer with preference order 0. If the same preference is defined in multiple dial peers with the same destination pattern, a dial peer is selected randomly.
I dont know if the router is smart enought to forward all calls on other backup if the primary line goes down.
I have configured dial-peer preference between two ISDN E1 lines and when a one ISDN line response "destination unreacheable" the router try in the second E1 line.
I was searching when preference takes effect but i didnt find much information.
Could please send the dial peer configuration?