No dial-peers needed?

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I have a question concerning dial-peers, or the lack of them.

At home I have a 2611xm which runs cme 3.3 and has a CIPC in a 192.168.1.0 network.
This router is connected to a 3640 router via 172.16.1.0 network.
A Laptop with CIPC is connected to the 3640 router via a 10.0.1.0 network.
There is RIP routing between the routers.

Both CIPC's register with the 2611xm's cme. Everything is fine here.

However, what really puzzles me is that I can ring from one CIPC to the other without configuring dial-peers despite the fact that they are on different networks and different routers.

When I do a show ephone I can see the ccme knows the IP addresses of the registered CIPC's.
Apparently you don't need dial-peers for ip phones if they register at the same ccme.
Does any know where I can find documentation on this subject?

 

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Well, I found the answer: CME creates automatically dial peers for every ephone-dn.
The way you can find out:

R#show dial-peers voice summary
TAG TYPE MIN OPER PREFIX DEST-PATTERN FER THRU SESS-TARGET STAT
PORT
1002 voip up up 1002 0 syst ipv4:172.16.1.2

Amazing.

 

I have no idea what you're on about, but I'm please you found your solution!

 

hahaha ditto!

 

Septima77,

The answer to your question is actually relatively simple to understand. CME, formerly IOST (IOS Telephony Service) is as you know a cut down IOS based IPT call processing solution.

So let me put it like this, when you register 2 phone in Callmanager - they can't call each other until they have a DN right? But once you assign the DN, CM knows where to direct the call via its mapping tables internally.

CME is really no different, except when the client (not just a CIPC) or handset registers to the CME system, if auto assign is enabled, then the mac devices or clients will be assigned a dynamic DN from the pool of numbers allocated. Since CME operated in IOS, it dynamically creates IOS dial-peers corresponding to the DN to hand (typically commencing with 200---). You will see this also in SRST configurations in FallBack mode (show dial-peer voice summary).

As a result, registering your client(s) means you don't need to create Dial-peers as that is done by default each time you create a DN. For example, when you configure the CME, and enter the command MAX-DN 10, then 10 default dial-peers will be created and ready to use when you create the DN numbers.

Also worth noting that being a default dial-peer, that it is actually possible to create dial-peer conflicts by creating a standard manual dial-peer the same as the ephone-dn dial-peer (rare - but this will help you understand the background).

I hope this helps with some of the theory?

Best regards,