According to RFC3261 :
It is possible for the CSeq sequence number to be higher than the remote sequence number by more than one. This is not an error condition, and a UAS SHOULD be prepared to receive and process requests with CSeq values more than one higher than the previous received request. So if I use a high value integer (maxint) I’m hoping the UAC will accept my message (though this will mess up future transactions, so other than BYE this is not a viable solution for an ongoing dialog). The other problem I see is that I can't get the route set, so this this would work only with UAC’s on the same network (not NAT/proxies/etc). If I needed to traverse NAT I would need something like Kamilio as Eric points out, to get the route set). Or…maybe PJSIP_HEADERS will give me the route set..I need to experiment with that one). Since this is just for my learning, I want to see if I can hangup a call in progress, running through the asterisk server. This is fun for my learning, so I realize there is of little practical value :) Brian From: asterisk-users [mailto:asterisk-users-boun...@lists.digium.com] On Behalf Of Joshua C. Colp Sent: Monday, June 26, 2023 3:56 PM To: Asterisk Users Mailing List - Non-Commercial Discussion <asterisk-users@lists.digium.com> Subject: Re: [asterisk-users] Get channel variables via ARI/AMI On Mon, Jun 26, 2023 at 4:35 PM TTT <li...@telium.io <mailto:li...@telium.io> > wrote: I think that’s getting me close. I’m trying to get (or recreate) the FROM and TO lines of the header, from a system running PJSIP. I think if I use CHANNEL to get local_uri and local_tag I can recreate a FROM line like: FROM=<URI>;tag=TAG And if I use CHANNEL to get remote_uri and remote_tag I can recreate a FROM line like: TO=<URI>;tag=TAG Would it be correct to assume that with this info (and ip:port info) I should be able to send a UDP SIP message from the PBX to the UA which appears to be part of the current call dialog? I realize this is an odd thing to do, but I’m just interested in technical feasibility at this point. Before I try to code this I want to ensure I’m not missing something stupid. Probably not. Sequence number also matters. -- Joshua C. Colp Asterisk Project Lead Sangoma Technologies Check us out at www.sangoma.com <http://www.sangoma.com> and www.asterisk.org <http://www.asterisk.org>
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