Hair pinning

[Rajnath Singh]

Is it possible to configure a hair pinning config where two IP phones try to call each other via the same Gateway without configuring a POTS dial peer? What are the relevant configs for MGCP / H.323 / SIP Gateways?

Any help would be appreciated.

RS.

[Jaime Valencia]

So, are you asking how to get two phones in the same GW to call each other and not hairpinn??

First of all, if all you got is a GW, then MGCP is not an option.

You can use CME, review the online documentation on it.

HTH

java

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[Rajnath Singh]

Hi Jamie,

Basically I want 2 phones in the same GW to call eack other. Is there any way to do it via H.323 / SIP, if so are there any sample configs?

Thanks,

RS...

[William Bell · Accepted solution]

What is throwing me off here is that the tendency is to assume that IP phones are leveraging a call procesing agent of some sort. A host that is responsible for call control. We are typically used to a client/server model when it comes to IP phone signaling. We assume phones are dumn, IOW.

So, with that in mind, Java was mentioning CME because it is a feature that can be loaded on a gateway to allow IP phones to register and communication. CME is basically a PBX (or key system if you must) and a SIP registrar/proxy. CME stands for Communications Manager Express. It is a licensed feature (i.e. pay for it).

You asked about SIP phones. So, CME with SIP configs can be found on CCO. One example:

http://www.cisco.com/en/US/products/sw/voicesw/ps4625/products_configuration_example09186a00808f33eb.shtml

Now, if your phones can operate in a peer-to-peer mode then you I suppose you can use a cisco gateway to route calls using voip dial-peers. You would need to have the ability to route IP-to-IP calls. This is also a licensed feature set. Search for Cisco Unified Border Element (CUBE).

HTH.

-Bill (@ucguerrilla)