My 2 cents
First sending multiple 180 with the same tags is completely valid.
Second, IMO a 183 would be a good answer for this. the only thing to be
careful here is if whether the voice has been cut already or not by MGW.
if it has not, then 183 wo/SDP should be good enough
if the voice has bee
On Tue, 2009-05-12 at 14:25 +0530, Kapil Saxena wrote:
> I have a MGW that has SIP interface towards UE and ISUP towards MSC.
>
> For a SIP->ISUP call:
>
> 1. MGW receives SIP INVITE from UE and sends IAM to MSC-A.
> 2. MGW receives backward ACM message with "called party status =
> free" fro
I have a MGW that has SIP interface towards UE and ISUP towards MSC.
For a SIP->ISUP call:
1. MGW receives SIP INVITE from UE and sends IAM to MSC-A.
2. MGW receives backward ACM message with "called party status = free" from
MSC-A.
3. MGW sends 180 Ringing towards SIP UE.
4. Called Part
