[SIPForum-discussion] General SIP Server Question

[杨伟]

Hi, Vivek

I am a little bit confused with case 3.

In case 3, both Proxy address and  outbound proxy address are set. I could
not any possibility a message will be sent to the Proxy. So it is not used?


2008/8/14, Vivek Batra <vivek7683 at gmail.com>:
>
> 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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>
>
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