[SIPForum-discussion] General SIP Server Question

[Vivek Batra]

Jerry,
Following possibilities are there in each SIP Phone.

1. When you configure only registrar address (or proxy address), SIP phone
sends the registration request and call request (INVITE etc) only to
registrar/ proxy address configured.

2. When you configure only outbound proxy address in SIP Phone (and not
registrar/ proxy address), SIP phone does not sends any registration request
however all other messages are send to outbound server only.

3. When you configure both registrar/ proxy and outbound proxy address, all
registration request and call request is send to outbound server only on IP
layer however the request is sent for specific domain only (which you have
been configured as registrar/ proxy address).

Difference between case1 and case3 is, you have not set the outbound in
case1 while it is in case3. Hence, in cas1, if registrar/ proxy server
redirect you to some other domain, SIP Phone tries to send the request to
redirected domain only. However, in case3, you have been set the outbound,
hence if outbound redirect you to some other domain, then also SIP phone
sends the new request to same outbound only which is configured.

Hence, the name of SIP entities depends on how you use it!!

Cheers!
Vivek

On Wed, Aug 13, 2008 at 10:45 AM, Jerry Richards
<jerryr at tonecommander.com>wrote:

> Hello All,
>
> General question regarding a SIP phone configuration where the phone
> communicates with a single SIP server.  Would you agree such a phone need
> only configure the following two SIP server entities?
>
> 1) SIP Registrar (either IP-address or domain-name) to be used inside the
> SIP messages for both registration and call-control.
>
> 2) SIP Proxy (either IP-address or domain-name) to only be used to identify
> where SIP messages are sent.  Basically, this is an Outbound Proxy.
>
> RFC 3261 uses Proxy and Outbound Proxy and Registrar as if there are three
> entities, so I'm a bit confused.
>
> Best Regards,
> Jerry
>
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