[SIPForum-discussion] Help required

[Taduru Hariprasad]

Hi man,

This feature called as Ring Back tone. If A is calling B, A will here
a song instead of asusual tring tring tone. This is completely the
Network feature.

In Sip this will happen as follow:

UA1 <--> Proxy1 <--> Proxy2 <--> UA2

Assume User Agent 1 calls UA2. A 180-Ringing message will be formed
along with the media which need to be played as a Ring Back tone to
UA1.
This configuration would have been done in SIP network.
Playing these tones taken care by Media cards in the UA1.

And in SS7 signalling, MSC will take care in playing the ring back tones.

Regards
Hariprasad

On 5/3/07, Dawn Somen-NXDR43 <NXDR43 at motorola.com> wrote:
>
> Hi!
>
> I am a student studying SIP and PSTN interworking at Motorola. I tried to
> find a answer to this query but couldn't yet.
> Could you please help me with this one?
>
> My query is as follows:
> Usually it is so that we can subscribe with our service provider of the
> cellular network for music (I mean if someone calls us he/she can hear some
> song or music instead of the usual phone ringing) Could you please tell me
> which device in the SIP network or PSTN network does this music playing
> specifically and where exactly I can find more information on this?
>
> Thanks a tonne!
>
> Regards,
> Somen
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