[SIPForum-discussion] Call Forward Unconditional How Proxy Knows that call needs to forward to a Gateway?

[mahesh b]

Michael : Go thru this draft. It will clear your doubts.

http://tools.ietf.org/html/draft-ietf-sipping-cc-transfer-12

On Tue, Sep 18, 2012 at 7:08 AM, Rohan Sarker <rohansarker at hotmail.com>wrote:

>  Michael: Just like in Model - View - Controller Communication in JAVA,
> the Proxy knows to forward to Gateway if it has limited resources or
> limited Control Logic or limited knowledge to process the call.
>
>
> *
> *
> *Regards*
> *Rohan Sarker*
> *+917278539338*
> *+913324288069*
>
> ------------------------------
> From: amit.chhikara at hotmail.com
> To: discussion at sipforum.org
> Date: Mon, 17 Sep 2012 19:40:24 +0530
> Subject: [SIPForum-discussion] Call Forward Unconditional How Proxy Knows
> that call needs to forward to a Gateway?
>
>
>               Alice           Proxy          Gateway
>              |                |              |
>              |    INVITE F1   |              |
>              |--------------->|              |
>              |(100 Trying) F2 |              |
>              |<---------------|              |
>              | (181 Call Is Being Forwarded) F3
>              |<---------------|   INVITE F4  |
>              |                |------------->|
>              |                |180 Ringing F5|
>              | 180 Ringing F6 |<-------------|
>              |<---------------|  200 OK F7   |
>              |    200 OK F8   |<-------------|
>              |<---------------|              |
>              |     ACK F9     |              |
>              |--------------->|    ACK F10   |
>              |                |------------->|
>              |    Both way RTP Established   |
>              |<=============================>|
>              |     BYE F11    |              |
>              |--------------->|   BYE F12    |
>              |                |------------->|
>              |                |   200 OK F13 |
>              |    200 OK F14  |<-------------|
>              |<---------------|              |
>              |                |              |
>
>
> I have following doubts regarding this Service Example:
>
> 1)Alive is calling Bob,but call is forwarded to gateway,So how proxy came to know where i need to forward this request?
> 2)How proxy is re-writing the Request-URI to the gateway URI?
>
>
> Thanks & Regards,
> Michael
>
>
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