[SIPForum-discussion] Call hold scenarios

[Prakash Singh Chaudhary]

Hi Dipen,

Find the detailed explanation below.

Older UA set the CONNECTION ADDRESS to 0.0.0.0 for putting a call on hold
but this method has been depreceted and newer method of using a=inactive is
being used.

There will be two changes in the SIP messages, while using a=inactive
method.

1. the attribute in SDP will be changed to a=sendonly
2. also, the SDP version will be incremented by 1
like if the original SDP had this line

o=prakash 1518515646 *21545722 *IN IP4 a2.abc.com

then the new SDP offer will be like this (the number incremented by 1,
21545723)

o=prakash 1518515646 *21545723 *IN IP4 a2.abc.com

Hope this is clear.

Regards.
Prakash Singh Chaudhary

On Thu, Jun 4, 2015 at 4:45 PM, Sakharam Thorat <sakharam.thorat at outlook.com
> wrote:

> i found following,
>
> Case 1 (a=sendonly used for putting call on hold)
>
> =====
> A wants to put call on Hold
>  A(INVITE a=sendonly)----------------->
>  B(200 ok a=recvonly)<------------------
>
> Now B wants to put call on hold ..it will send inactive or sendonly...this
> is also debatable
>  B(INVITE a=inactive) <-----------------
>  A(200 ok a=inactive) ------------------>
>
>
> Case 2 (a=inactive used for putting call on hold)
> =====
> A wants to put call on Hold
>  A(INVITE a=inactive)----------------->
>  B(200 ok a=inactive)<------------------
>
>
>
>
> Best Regards,
> Sakharam Thorat.
>
>
> ------------------------------
> Date: Wed, 3 Jun 2015 22:11:06 +0530
> From: m.dipan1987 at gmail.com
> To: discussion at sipforum.org
> Subject: [SIPForum-discussion] Call hold scenarios
>
>
> Hi All,
>
> Could anyone please explain in detail some real time examples for call
> hold scenario for attribute like
>
> a = sendonly  [ media is still sent]
>
> a=inactive     [ no media is sent]
>
>
>
> --
>
>
>
>
> Regards,
> Dipan Kumar
> Sr.Software Engineer | HCL technologies
>
>
>
>
>
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-- 


Regards.
Prakash Singh Chaudhary
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