29 Dec
2022
29 Dec
'22
10:48 p.m.
Hello,
as mentioned before, have a look to the 400 reply reason phrase. This was done quite good
from their side, better than many other vendors.
Usually, Teams is not too bad if you are using a defined infrastructure that do not
introduce too many variables. We are usually using a B2BUA in our customer projects for
that purpose.
Cheers,
Henning
--
Henning Westerholt – https://skalatan.de/blog/
Kamailio services – https://gilawa.com<https://gilawa.com/>
From: Brandon Armstead <brandon(a)cryy.com>
Sent: Thursday, December 29, 2022 7:52 PM
To: Kamailio (SER) - Users Mailing List <sr-users(a)lists.kamailio.org>
Subject: [SR-Users] Re: Direct Routing, SIP, INVITE TO TEAMS (400 BAD REQUEST)
Alex & Kaufman,
Appreciate the feedback. The pastebin is one example of about 1000+ iterations
literally of changes. So I'm finally reaching out :). I haven't tested the
socket attribute in record-route change, I will try this now. As for the angle brackets
I've tried with and without, etc (already) to no effect. The SDP unknown media type
seems to be a Poly thing, so I *want* to rule this out as its not in my other SDP's
and still receive 400 bad request.
One more iteration here we go... please feel free to let me know if you have any other
thoughts on the matter :).
Thanks!
- Brandon
On Thu, Dec 29, 2022 at 8:08 AM Alex Balashov
<abalashov@evaristesys.com<mailto:abalashov@evaristesys.com>> wrote:
Yeah, the grammar says that rr-params are just generic-params, in which case it's not.
I didn't see that -- nicely spotted!
I think that may be the basis of the 400 Bad Request. I'd be shocked if it
weren't.
The broken clock of "Microsoft SIP" can still be right twice a day.
On Dec 29, 2022, at 10:31 AM, Kaufman
<bkaufman@bcmone.com<mailto:bkaufman@bcmone.com>> wrote:
In your top Record-Route you have:
socket=;
Not sure if that is legal.
Kaufman
-----Original Message-----
From: Alex Balashov
<abalashov@evaristesys.com<mailto:abalashov@evaristesys.com>>
Sent: Thursday, December 29, 2022 9:02 AM
To: Kamailio (SER) - Users Mailing List
<sr-users@lists.kamailio.org<mailto:sr-users@lists.kamailio.org>>
Subject: [SR-Users] Re: Direct Routing, SIP, INVITE TO TEAMS (400 BAD REQUEST)
Sorry to hear you're having to interoperate with Teams. It's a unique form of
sadism I wouldn't wish upon anyone.
A few theories:
1) Microsoft doesn't like the "bare" Contact header-value here:
Contact: sip:+MY_FROM_PHONE_NUMBER_HERE@MY_FQDN_WAS_HERE:5061;transport=tls
Unlike the careted one right above:
P-Asserted-Identity: <sip:+MY_FROM_PHONE_NUMBER_HERE@MY_FQDN_WAS_HERE>
A bare URI absent other header-params is of course completely legal, but I'm really
trying to get inside the imaginary world of antisocial "Microsoft SIP" here.
2) Could it be that antisocial "Microsoft SIP" sends 400 as a way of objecting
to something in the SDP, e.g. where a non-demented SIP stack would send "488 Not
Acceptable Here" or "415 Unsupported Media Type"?
I know you've said you tried multiple clients to rule that out, but I wonder if the
thing it's objecting to hasn't been ruled out that way.
3) I saw this media line in the SDP:
m=application 41356 <unknown media type>
What's that?
-- 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/
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On Dec 29, 2022, at 9:51 AM, Brandon Armstead
<brandon@cryy.com<mailto:brandon@cryy.com>> wrote:
Outbound calls from my SBC into Teams (Polycom -> SBC -> Teams) always result in a
400 BAD REQUEST.
Example invite below:
https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fpast
ebin.com<http://ebin.com>%2FF1G1Ce59&data=05%7C01%7Cbkaufman%40bcmone.com<http://40bcmone.com>%7C55672dbf739
a4ff447f008dae9b0c9b2%7Cafc1818e7b6848568913201b9396c4fc%7C1%7C0%7C638
079242759152531%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2
luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=Cbff6B4gNr8
A9zs89smJ129y8IyNM9%2B3zVkGhlzpa54%3D&reserved=0
I've taken care to make sure numbers are all E.164 format in From/To/Contact.
I've also taken care to make sure that FQDN is used in Contact and Record-Route
header.
I've tried many different variations and have followed the SIP information here:
https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Flear
n.microsoft.com<http://n.microsoft.com>%2Fen-us%2Fmicrosoftteams%2Fdirect-routing-protocols-si
p&data=05%7C01%7Cbkaufman%40bcmone.com<http://40bcmone.com>%7C55672dbf739a4ff447f008dae9b0c
9b2%7Cafc1818e7b6848568913201b9396c4fc%7C1%7C0%7C638079242759152531%7C
Unknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1h
aWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=GO26A9FOOoS42yMCWPPGo5PkKo75c
kjSJSkjAeYRsU0%3D&reserved=0 I've also tried several different clients
(Bria, Polycom CCX 600, Grandstream, etc) to see if maybe it was something in the SDP or
otherwise causing an issue.
SIP Transport is TLS, RTP is SRTP
I might also add that OPTION pings are active and Direct Routing Endpoint is active, so
this is successful. I also am able to receive calls FROM teams to my IP phone(s) without
issue. It is only when I try and call INTO teams (INVITE -> Microsoft Teams) that I
always receive a 400 BAD REQUEST to my INVITE.
Any help is appreciated, thank you!
- Brandon
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Alex Balashov | Principal | Evariste Systems LLC
Tel: +1-706-510-6800 / +1-800-250-5920 (toll-free)
Web:
https://nam11.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.evaris…p;reserved=0,
https://nam11.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.csrpsw…
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