[SIPForum-discussion] SIP Call Control

[AMIT ANAND]

Hi,

Your query is not clear. Do you  want that the call should go to soft phone
as well as to the  hard phone.

Amit Anand

On Fri, Jul 18, 2008 at 12:10 AM, Jamie Chen <jamiechen168 at gmail.com> wrote:

> Hi there,
>
> First of all, many thanks for people's feedbacks in the other email thread
> with subject "Controlling SIP UA from the application". I learned a lot from
> your response. I have the further questions in term of SIP Call Control.
>
> Let's say the end user has a SIP hard phone and you want your application
> to monitor it and controlling it from your application. For example, when
> there is an inbound call arrives, the SIP hard phone shows the inbound call.
> And your application also shows the inbound call too. But the end user can
> answer the call from your application. The call is then connected to the
> user's hard phone and the RTP voice stream is sent to this SIP hard phone.
>
> Can we achieve this through having a SIP soft phone in the application? But
> it seems that both of SIP soft phone and hard phone cannot co-exist because
> they are 2 UAs. So I am wondering whether we can use SIP to do call control
> on the other one. In this case, can we use some form of SIP soft phone to
> control the SIP hard phone.
>
> Some people were saying this has to do with "SIP Forking". But after my
> research, it seems that SIP Forking is meant to fork multiple SIP Requests
> (e.g. INVITE) and expect one response back. But in this case, we are
> actually cloning each SIP requests and each SIP responses to both UAs. If I
> think deeper, I don't think a regular SIP server can do this and I am not
> sure if this is part of SIP spec.
>
> Thanks again for your advice.
>
>
>
>
>
>
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