[SIPForum-discussion] Customized Media Flow

[Chittaranjan Panda]

Hello Ashoke,

Below policies is taken for local/remote(customized) playback using 
180/183 .

1. Unless a 180 (Ringing) response is received, never generate  local 
ringing.
2. If a 180 (Ringing) has been received but there are no incoming   
media packets, generate local ringing.
3. If a 180 (Ringing) has been received and there are incoming  media 
packets, play them and do not generate local ringing.

When UAC receives 183 + SDP it assumes that media flow will start from 
UAS. For this the media flow is one way.This information can be provided 
by UAS using SDP attribute.
This is not mandatory.

When UAC receives 200 OK then all the early media should stop. Because 
UAS may change the media port and media type in 200 OK.

For better understanding you can refer RFC:3960.

Thanks,
-Chitta






Ashoke Kumar Ghosh wrote:
>
> Dear SIP Forum Members,
>
>  
>
> We are having an application server working as B2BUA mode.
>
>  
>
> I want to test if some customized ring back tone can be played. Can 
> somebody help with the following understanding.
>
>  
>
> 1.       Can I suppress the media when I get 180 Ringing/183 Session 
> Progress.
>
> 2.       After the customized media has been played, can I resume the 
> media flow if 200 OK has not been received.
>
> 3.       If a 200 OK is received during customized media flow, can I 
> send the B party SDP to A party by suspending the customized media.
>
>  
>
> Regards....
>
>  
>
> Ashoke Ghosh
>
> ------------------------------------------------------------------------
>
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