[Sip-implementors] When Does RTP should start flowing after 18x or 200OK/ACK

2015-05-29 Thread Ambrish Kumar
Dear Team, I am working on Lawful interception and integrating our IMS nodes (SBC) with LEA. We have got a very unusual ask form IB/RAW where they want to listen the RTP flow before call is actually answered by “B” We need your help and confirmation from any RFC which clarifies when does Media

Re: [Sip-implementors] When Does RTP should start flowing after 18x or 200OK/ACK

2015-05-29 Thread Adelia Chetreanu
They probably want to listen to the Early Media RTP : https://tools.ietf.org/html/rfc3960. Answer to your first question is 'yes. At that time you'll probably capture prompts and ring tones only - it won't be a conversation between A and B. Although you might have RTP from both A and B (I think

Re: [Sip-implementors] When Does RTP should start flowing after 18x or 200OK/ACK

2015-05-29 Thread Ambrish Kumar
Hi Paul and Adelia, Thanks for the prompt response. So as per standard its feasible to relay the RTP media as soon as offer answer is completed i.e. even after reliable 18x response. I agree RBT should be heard to Fanout number(LEA) but what I need to implement is to send actual RTP. I am not

Re: [Sip-implementors] When Does RTP should start flowing after 18x or 200OK/ACK

2015-05-29 Thread Adelia Chetreanu
Ambrish, What I do when things don't make sense to me is ask the customer for an example of use. Lots of times - if not all times - they have a good reason for asking and then you will better understand the requirement and maybe figure out a better solution. One thing that comes to mind is

Re: [Sip-implementors] When Does RTP should start flowing after 18x or 200OK/ACK

2015-05-29 Thread Paul Kyzivat
On 5/29/15 1:33 PM, Ambrish Kumar wrote: Hi Paul and Adelia, Thanks for the prompt response. So as per standard its feasible to relay the RTP media as soon as offer answer is completed i.e. even after reliable 18x response. Even after an *un*reliable 1xx response. And one way media even

Re: [Sip-implementors] When Does RTP should start flowing after 18x or 200OK/ACK

2015-05-29 Thread Paul Kyzivat
On 5/29/15 12:11 PM, Ambrish Kumar wrote: Dear Team, I am working on Lawful interception and integrating our IMS nodes (SBC) with LEA. We have got a very unusual ask form IB/RAW where they want to listen the RTP flow before call is actually answered by “B” We need your help and confirmation