Cool. Thats what I thought.  I'll play around with it.

Thanks.

On Wed, Sep 2, 2009 at 9:18 PM, Stefan Sayer <[email protected]>wrote:

> Hi,
>
> o Duane Larson [09/03/09 00:50]:
>
>> So when I read the explaination of SEMS early_announce it says "(pre-call)
>> announcement using early media (183), optionally continues the call in B2BUA
>> mode"
>>
>> Does this mean that when the caller calls the callee, instead of hearing
>> the ringing sound while you are waiting for the callee to pick up the caller
>> will hear whatever wav file you want them to hear?  Is that what
>> early_announce does?
>>
> yes.
>
>  If so what happens if the wav file isn't done playing but the callee picks
>> up?  Does the wav file get cut off and you are able to talk to the callee?
>>
> yes.
>
> early media announcements can be used for various things, for example
> custom ring back tone, or telling the cost of a call before the actual call.
>
> For custom ring back tone, you use the normal mode. At the proxy you add
> another branch (forking proxy) and send that to SEMS, and have SEMS play the
> RBT as early media which the caller hears while the call is proceeding. When
> the callee picks up, the proxy cancels the branch to SEMS, and caller talks
> to callee.
>
> For the other use (pre call announcement), you send the call to SEMS, where
> you set continue_b2b=true, which plays a file with the cost of the call, and
> then establishes a call in B2BUA mode to the callee.
>
> For the second use case you could also have sent the call to SEMS, play the
> file, and when it is finished catch the reply from SEMS at the proxy, and
> then add a new branch to the callee (sequential forking) - iff your proxy is
> clever enough to do that.
>
> Stefan
>
>
>>
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>>
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>
> --
> Stefan Sayer
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>
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