Hi Roman, On Tue, Apr 23, 2019 at 05:33:37PM -0400, Roman Shpount wrote:
> The most basic use case is click-to-call scenario. You have a web site or > an application that imitates a call between two SIP end points. User clicks > the web site which causes some sort of SIP application server to send an > INVITE without an offer sent to SIP end point 1. SIP application server > gets the answer with the SDP offer in 200 OK response to the initial INVITE > to end point 1, and then sends this offer to SIP end point 2. SIP End point > 2 answers the call with answer in the SDP in 200 OK response. SIP > Application server send the answer from end point 2 in ACK to SIP end point > 1. As a result, SIP signaling flow goes through SIP application server, but > media goes direct between SIP end points 1 and 2. I think I'm starting to understand what you and Paul are saying. There's nothing to offer in the initial INVITE, so you're asking one of the endpoints to provide the offer that starts the process instead. That seems obvious in hindsight, but I hadn't really considered it, since most of the click-to-call type scenarios I'm familiar with use the INVITE-hold-REFER approach. Thanks a lot, guys! -- Alex -- Alex Balashov | Principal | Evariste Systems LLC Tel: +1-706-510-6800 / +1-800-250-5920 (toll-free) Web: http://www.evaristesys.com/, http://www.csrpswitch.com/ _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
