How to make several connections from one IP

Description

Sometimes it is necessary to make several connections from one IP (server usually) to MOR to separate traffic.

Main rules how to do that:

1. Devices should be DYNAMIC and should REGISTER to MOR
2. In INVITE packet from external server in line From: should be visible, which device is dialing. (If external server is Asterisk, then in MOR descriptions (in sip.conf file) on external server, should be fromuser= lines which points which device is dialing - check explanation in details below)

If devices are not configured properly, then call from external server to MOR is possible, but only 1 device will be billed all the time or only 1 trunk will be active (depends on misconfiguration).

Possible error on misconfiguration:

WARNING[2836]: chan_sip.c:8385 check_auth: username mismatch, have <XXXX>, digest has <YYYY>

SIP INVITE packet

As described previously correct SIP INVITE packet should be received in order for MOR to correcly authenticate user.

Good SIP INVITE packet

INVITE sip:3908155xxxxx@82.215.xxx.xxx SIP/2.0
Via: SIP/2.0/UDP 82.215.xxx.xxx:5060;branch=z9hG4bK50ef8b9b;rport
From: "39081761xxxxx" <sip:1028@82.215.xxx.xxx>;tag=as3b117c95
To: <sip:390815517304@82.215.xxx.xxx>
Contact <sip:1028@82.215.xxxx.xxx>
Call-ID: 2f6f09f8498065164a9aadae5ef123cf@82.215.xxx.xxx
CSeq: 102 INVITE
User-Agent: Asterisk PBX
Max-Forwards: 70
Date: Fri, 19 Feb 2010 12:28:03 GMT
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Content-Type: application/sdp
Content-Length: 242

Bad SIP INVITE packet

INVITE sip:3908155xxxxx@82.215.xxx.xxx SIP/2.0
Via: SIP/2.0/UDP 82.215.xxx.xxx:5060;branch=z9hG4bK7edd0b9e;rport
From: "3908176xxxxx" <sip:3908176xxxxx@82.215.xxx.xxx>;tag=as1b7e883e
To: <sip:3908155xxxxx@82.215.xxx.xxx>
Contact: <sip:3908176xxxxx@82.215.xxx.xxx>
Call-ID: 1efdd14505519d1a6b769e5c269f555d@82.215.xxx.xxx
CSeq: 103 INVITE
User-Agent: Asterisk PBX
Max-Forwards: 70
Proxy-Authorization: Digest username="1028", realm="asterisk", algorithm=MD5, uri="sip:3908155xxxxx@82.215.xxx.xxx", nonce="0f96c765", response="df7b502821c03ad43222d007b20dbf84", opaque=""
Date: Fri, 19 Feb 2010 12:17:41 GMT
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Content-Type: application/sdp
Content-Length: 242

Example

Lets say we have MOR and another Asterisk server from which we want to configure 2 connections to MOR.

First on MOR we need to describe such connections as Devices for different Users.

We will create 2 devices 1028 and 1009 for these connections:

(Important parts are marked in RED)