From peter.manley@kombea.com Sat Jun 26 00:44:18 2021
From: Peter Manley <peter.manley@kombea.com>
To: sr-users@lists.kamailio.org
Subject: [SR-Users] Guidance building a WebRTC to Asterisk Intermediate Proxy
Date: Fri, 25 Jun 2021 22:44:11 +0000
Message-ID: <CY4PR1001MB21331D5A5E72594B612873E7F0069@CY4PR1001MB2133.namprd10.prod.outlook.com>
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Hello,

I'm working on building an RTP Proxy which will allow both regular SIP to SIP=
 transactions and WebRTC to SIP transactions to an Asterisk Server.

SIP UAC < ---UDP/SIP --- > Kamailio/RTPEngine Proxy < ---UDP/SIP----- > Aster=
isk Server

AND

WebRTC UAC < ---WSS--- > Kamailio/RTPEngine Proxy < ---UDP/SIP----- > Asteris=
k Server

The Kamailio/RTPEngine Proxy is stateless (does not use the tm or registerer =
modules), and uses the Path module to replace the Route header with a Path he=
ader.

It works grep for SIP/UDP to SIP/UDP transactions.

HOWEVER... It only partially works for WSS to SIP/UDP transactions. The REGIS=
TER/401(Unauthorized), REGISTER/200(OK) transaction works well.

When the Asterisk server sends a SIP Options message, I get the following err=
or:
Jun 25 15:47:03 VRTPENGINE kamailio[4953]: INFO: <script>: =3D> OPTIONS < sip=
:l4umfumh(a)192.0.2.97;transport=3Dws;alias=3D209.141.117.212~59751~6 -> <nul=
l> (IP:172.16.0.48:sp)
Jun 25 15:47:03 VRTPENGINE kamailio[4953]: WARNING: <core> [core/msg_translat=
or.c:2815]: via_builder(): TCP/TLS connection (id: 0) for WebSocket could not=
 be found
Jun 25 15:47:03 VRTPENGINE kamailio[4953]: ERROR: <core> [core/msg_translator=
.c:2003]: build_req_buf_from_sip_req(): could not create Via header
Jun 25 15:47:03 VRTPENGINE kamailio[4953]: ERROR: <core> [core/forward.c:550]=
: forward_request(): building failed
Jun 25 15:47:03 VRTPENGINE kamailio[4953]: WARNING: <core> [core/receive.c:42=
5]: receive_msg(): error while trying script

It appears that the WebSocket corresponding to the WSS leg cannot be located =
when the request is initiated from the Asterisk Server.

Any thoughts on how I can get this to work in the other direction (Asterisk t=
o Kamailio)? I've been looking at the WebRTC to SIP Client and Server (https:=
//github.com/havfo/WEBRTC-to-SIP), but that doesn't quite do what I want it t=
o do (i.e. it appears to act as a registrar server and doesn't forward REGIST=
ER requests on to another registrar).


Thanks and regards,

Peter H. Manley, Ph.D.
Chief Software Architect
KomBea Corporation
3400 North Ashton Blvd, Suite 470<https://urldefense.proofpoint.com/v2/url?u=
=3Dhttps-3A__maps.google.com_-3Fq-3D3400-2BNorth-2BAshton-2BBlvd-2C-2BSuite-2=
B470-2B-250D-250A-2BLehi-2C-2BUtah-2B84043-26entry-3Dgmail-26source-3Dg&d=3DD=
wMF-g&c=3DaXfg9j-An5sFdflqnjAj_USiCjXm5xEBIX8lTgWEt0U&r=3DykVOlDeeWPn-JjTs8av=
ieNrFskQ3kNzjf6_Jn_wG5HLeLIRsvzCN4-dJx6BFR4el&m=3DMMSIepRfj2CXVMH3CH8SghyPAoo=
nRISMH__5bcNFPLM&s=3DC4toC0HQ2JwHKiamawbqvdjdidlwyhCP0XVneFagwkY&e=3D>
Lehi, Utah 84043<https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__maps.=
google.com_-3Fq-3D3400-2BNorth-2BAshton-2BBlvd-2C-2BSuite-2B470-2B-250D-250A-=
2BLehi-2C-2BUtah-2B84043-26entry-3Dgmail-26source-3Dg&d=3DDwMF-g&c=3DaXfg9j-A=
n5sFdflqnjAj_USiCjXm5xEBIX8lTgWEt0U&r=3DykVOlDeeWPn-JjTs8avieNrFskQ3kNzjf6_Jn=
_wG5HLeLIRsvzCN4-dJx6BFR4el&m=3DMMSIepRfj2CXVMH3CH8SghyPAoonRISMH__5bcNFPLM&s=
=3DC4toC0HQ2JwHKiamawbqvdjdidlwyhCP0XVneFagwkY&e=3D>
www.kombea.com<https://urldefense.proofpoint.com/v2/url?u=3Dhttp-3A__www.komb=
ea.com_&d=3DDwMF-g&c=3DaXfg9j-An5sFdflqnjAj_USiCjXm5xEBIX8lTgWEt0U&r=3DykVOlD=
eeWPn-JjTs8avieNrFskQ3kNzjf6_Jn_wG5HLeLIRsvzCN4-dJx6BFR4el&m=3DMMSIepRfj2CXVM=
H3CH8SghyPAoonRISMH__5bcNFPLM&s=3DocueS1ZL34IN6qr14M-aItGjeJGQ2km5U2zpzO4Fyqw=
&e=3D>

Office:+1.801.610.5808
Mobile +1.801.243.7773




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--===============1567703083==--


From shaheryarkh@gmail.com Sat Jun 26 03:58:08 2021
From: M S <shaheryarkh@gmail.com>
To: sr-users@lists.kamailio.org
Subject:
 Re: [SR-Users] Guidance building a WebRTC to Asterisk Intermediate Proxy
Date: Sat, 26 Jun 2021 03:57:27 +0200
Message-ID:
 <CAFZQphyZE_tGB9=5tFQBtXAv5twMh=9aCNFAvveGf0-L=y_qwQ@mail.gmail.com>
In-Reply-To: =?utf-8?q?=3CCY4PR1001MB21331D5A5E72594B612873E7F0069=40CY4PR10?=
 =?utf-8?q?01MB2133=2Enamprd10=2Eprod=2Eoutlook=2Ecom=3E?=
MIME-Version: 1.0
Content-Type: multipart/mixed; boundary="===============0888220475=="

--===============0888220475==
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: quoted-printable

The problem seems to that the kamailio is trying to route it over UDP port
using WSS transport, which will never work.

You are creating a transport bridge (UDP <-> WSS i.e. stateless transport
<-> stateful transport) as well media bridge (RTP <-> SRTP), so it is going
to be tricky. I strongly discourage it since things get messy for
sequential requests. But you can try the following,

Here are some PATH module parameters and functions, you will need to setup.

1. You will need to enable "use_received" parameter to ensure connection
tracking.
2. It seems you may have enabled "received_format", so you make sure you do
NAT detection and use "handle_ruri_alias" for initial requests.
3. You must also enabled "enable_r2", but with caution, since both ends
(i.e. UAC and UAS) can be using same kamailio (proxy) socket for in/out.
4. Make sure to use "add_path_received" instead of "add_path".
5. If using OUTBOUND module then make sure it is loaded BEFORE the PATH
module.

Thank you.

--
Muhammad Shahzad Shafi
Burraq Technologies
Tel: +49 176 99 83 10 85



On Sat, Jun 26, 2021 at 12:47 AM Peter Manley <peter.manley(a)kombea.com>
wrote:

> Hello,
>
>
>
> I=E2=80=99m working on building an RTP Proxy which will allow both regular =
SIP to
> SIP transactions and WebRTC to SIP transactions to an Asterisk Server.
>
>
>
> SIP UAC < ---UDP/SIP --- > Kamailio/RTPEngine Proxy < ---UDP/SIP----- >
> Asterisk Server
>
>
>
> AND
>
>
>
> WebRTC UAC < ---WSS--- > Kamailio/RTPEngine Proxy < ---UDP/SIP----- >
> Asterisk Server
>
>
>
> The Kamailio/RTPEngine Proxy is stateless (does not use the tm or
> registerer modules), and uses the Path module to replace the Route header
> with a Path header.
>
>
>
> It works grep for SIP/UDP to SIP/UDP transactions.
>
>
>
> HOWEVER=E2=80=A6 It only partially works for WSS to SIP/UDP transactions. T=
he
> REGISTER/401(Unauthorized), REGISTER/200(OK) transaction works well.
>
>
>
> When the Asterisk server sends a SIP Options message, I get the following
> error:
>
> Jun 25 15:47:03 VRTPENGINE kamailio[4953]: INFO: <script>: =3D> OPTIONS <
> sip:l4umfumh(a)192.0.2.97;transport=3Dws;alias=3D209.141.117.212~59751~6 ->
> <null> (IP:172.16.0.48:sp)
>
> Jun 25 15:47:03 VRTPENGINE kamailio[4953]: WARNING: <core>
> [core/msg_translator.c:2815]: via_builder(): TCP/TLS connection (id: 0) for
> WebSocket could not be found
>
> Jun 25 15:47:03 VRTPENGINE kamailio[4953]: ERROR: <core>
> [core/msg_translator.c:2003]: build_req_buf_from_sip_req(): could not
> create Via header
>
> Jun 25 15:47:03 VRTPENGINE kamailio[4953]: ERROR: <core>
> [core/forward.c:550]: forward_request(): building failed
>
> Jun 25 15:47:03 VRTPENGINE kamailio[4953]: WARNING: <core>
> [core/receive.c:425]: receive_msg(): error while trying script
>
>
>
> It appears that the WebSocket corresponding to the WSS leg cannot be
> located when the request is initiated from the Asterisk Server.
>
>
>
> Any thoughts on how I can get this to work in the other direction
> (Asterisk to Kamailio)? I=E2=80=99ve been looking at the WebRTC to SIP Clie=
nt and
> Server (https://github.com/havfo/WEBRTC-to-SIP), but that doesn=E2=80=99t q=
uite
> do what I want it to do (i.e. it appears to act as a registrar server and
> doesn=E2=80=99t forward REGISTER requests on to another registrar).
>
>
>
>
>
> Thanks and regards,
>
>
>
> *Peter H. Manley, Ph.D.*
>
> Chief Software Architect
>
> KomBea Corporation
>
> 3400 North Ashton Blvd, Suite 470
> <https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__maps.google.com_-3F=
q-3D3400-2BNorth-2BAshton-2BBlvd-2C-2BSuite-2B470-2B-250D-250A-2BLehi-2C-2BUt=
ah-2B84043-26entry-3Dgmail-26source-3Dg&d=3DDwMF-g&c=3DaXfg9j-An5sFdflqnjAj_U=
SiCjXm5xEBIX8lTgWEt0U&r=3DykVOlDeeWPn-JjTs8avieNrFskQ3kNzjf6_Jn_wG5HLeLIRsvzC=
N4-dJx6BFR4el&m=3DMMSIepRfj2CXVMH3CH8SghyPAoonRISMH__5bcNFPLM&s=3DC4toC0HQ2Jw=
HKiamawbqvdjdidlwyhCP0XVneFagwkY&e=3D>
>
> Lehi, Utah 84043
> <https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__maps.google.com_-3F=
q-3D3400-2BNorth-2BAshton-2BBlvd-2C-2BSuite-2B470-2B-250D-250A-2BLehi-2C-2BUt=
ah-2B84043-26entry-3Dgmail-26source-3Dg&d=3DDwMF-g&c=3DaXfg9j-An5sFdflqnjAj_U=
SiCjXm5xEBIX8lTgWEt0U&r=3DykVOlDeeWPn-JjTs8avieNrFskQ3kNzjf6_Jn_wG5HLeLIRsvzC=
N4-dJx6BFR4el&m=3DMMSIepRfj2CXVMH3CH8SghyPAoonRISMH__5bcNFPLM&s=3DC4toC0HQ2Jw=
HKiamawbqvdjdidlwyhCP0XVneFagwkY&e=3D>
>
> www.kombea.com
> <https://urldefense.proofpoint.com/v2/url?u=3Dhttp-3A__www.kombea.com_&d=3D=
DwMF-g&c=3DaXfg9j-An5sFdflqnjAj_USiCjXm5xEBIX8lTgWEt0U&r=3DykVOlDeeWPn-JjTs8a=
vieNrFskQ3kNzjf6_Jn_wG5HLeLIRsvzCN4-dJx6BFR4el&m=3DMMSIepRfj2CXVMH3CH8SghyPAo=
onRISMH__5bcNFPLM&s=3DocueS1ZL34IN6qr14M-aItGjeJGQ2km5U2zpzO4Fyqw&e=3D>
>
>
>
> Office:+1.801.610.5808
>
> Mobile +1.801.243.7773
>
>
> __________________________________________________________
> Kamailio - Users Mailing List - Non Commercial Discussions
>   * sr-users(a)lists.kamailio.org
> Important: keep the mailing list in the recipients, do not reply only to
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>



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--===============0888220475==--