How to make several connections from one IP

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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:

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