SIP Proxy: is it always needed?

Unanswered Question
May 10th, 2010

Hi all,

I have a vey simple VoIP network to implement: three sites connected by a Frame-Relay cloud with a VoIP VLAN in each site. I have to connect two IP Phones (7960) for each site and they must communicate among them, while there is no need to interface with analog telephone networks.

I woudl like to use SIP and, as far as I know, it is a peer-to-peer protocol, so I guess it does not need a centralized manager. I know about SIP proxy, but I guess it is not needed, though it may be used. However, tha IP phone configuration guide seems to state that you must configure a SIP proxy. Is this true? In this case, can it be implemented by a router with advanced security IOS?

Thanks a lot in advance,


I have this problem too.
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htluo Mon, 05/10/2010 - 13:10

Are you talking about CME?

In SIP world, proxy is not rquired.


gianluca2891 Mon, 05/10/2010 - 14:08

Thanks for your help. Well, in the Cisco SIP IP Phone 7960 Administrator guide, more specifically in the "Manually Configuring SIP Parameters" paragraph, it is stated:

Proxy Address—(Required for the first line configured on the phone) IP
address of the primary SIP proxy server that will be used by the phone.

This makes me confused.

Paolo Bevilacqua Mon, 05/10/2010 - 14:23

Disregard the phone guides. All the configuration is done in the call manager.

Note, either you use cisco call manager or not, hire a reputable consultant to configure your voice network. If you don't do thta, you will encounter major problems and frustration.

Anyway, you cannot use Cisco SIP phone without a call manager.


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