How to make several connections from one IP

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Description

In order to separate traffic, it is sometimes necessary to make several connections to MOR from one IP (usually a server).

The main rules for how to do this are:

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

If the devices are not configured properly, then a call from external server to MOR is possible, but only one device will be billed all the time or only one trunk will be active (it depends on the 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, the correct SIP INVITE packet should be received in order for MOR to authenticate the user correctly.

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

Let's say we have MOR and another Asterisk server from which we want to configure two connections to MOR.




MOR configuration

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

We will create two devices, 1028 and 1009, for these connections:

(Important parts are marked in RED)

Device from sameip1.png


Device from sameip2.png




Remote server configuration

The remote server in our example is Asterisk, so its configuration should be in sip.conf file, which describes both connections and registers to MOR: 

[general]

register => 1028:ewpjxxxx@82.215.xxx.xxx/1028
register => 1009:ca5hxxxx@82.215.xxx.xxx/1009


[authentication]

[mor1028]
canreinvite=no
host=82.215.xxx.xxx
user=1028
username=1028
secret=ewpjxxxx
type=peer
fromuser=1028
 
[mor1009]
canreinvite=no
host=82.215.xxx.xxx
user=1009
username=1009
secret=ca5hxxxx
type=peer
fromuser=1009




Limitations

It is not possible to send CallerID from a remote server this way, because "fromuser" overwrites the CallerID field.

You can only hardcode CallerID in MOR for every user account.

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