[SIPForum-discussion] COnference Doubt

[Vivek Batra]

Abhishek,
May u please elaborate the points inline in RED.

--Vivek

On Wed, Aug 13, 2008 at 7:27 AM, <abhishek.chattopadhyay at wipro.com> wrote:

>  Hello All
>
> I am confused about a particular call flow scenario.
>
> Can anybody tell me how exactly would be the messaging for the scenario
> below?
>
>
> There are three parties*** phone 1****, phone******** 2 and**** phone****3.
> *
>
> ***Phone 1* registers to*** gateway 1*
>
> ***Phone**** 2* registers to*** gateway**** 2*
>
> ***Phone**** 3* registers to*** gateway**** 3*
>
> Ps: none of the phones are pure sip entity they register to the gateway
> and the gateway takes care of the signaling on behalf of the phones as
> instances as if they were UACs.
>
 What u r referring a gateway?? Is it stateless proxy or B2BUA?

RTP is relayed through gateway or established directly between phones?

>
>
> ***SCENARIO:*****
>
> 1.*** phone**** 2* initiates a call to*** phone**** 1*
>
> 2.*** phone******** 2* puts*** phone**** 1* on hold.
>
> 3.*** phone**** 2* initiates a call to*** phone**** 3.*
>
> 4.*** phone**** 2* now puts*** phone**** 1* and*** phone**** 3* in a
> conference.
>
Now conference occurs in Phone2??
Which entity is responsible of mixing the audio stream? Gateway or Phone?

> 5. All the phones are in conference now.
>
> 6. Suddenly*** gateway******** 1*(conference initiator) is rebooting.
>
Conference is initiated in Phone2 or gateway1?

7. Still conference continues among all phones.
>
> 8. Now*** phone 2* hangs up.
>
> ***Questions:*
>
> 1.     ** will the conference be still carry on between*** phone 1* and***
> phone******** 3*?
>
> 2.      what would be an appropriate signal flow among all parties.(***gateway
> 2 to gateway 1*)   &  (***gateway 2 to gateway 3*)?
>
How gateway knows the address of other gateways? If gateway is acting as
UAC, is it registered with other gateways or other gateways address is
manually configured?

> 3.      what if the*** gateway 1* would not have rebooted and*** gateway 2
> * is ganging up how would be the signaling be ?
>
>
> ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
>
>
> Regards
>
>
>
> ABHISHEK
>
> mob:+91- 9986338807
>
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>
> ext: +91-80-28528857 80373
>
>
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