[Asterisk-Users] voice mail - sip:notify message

[SW]

Hi folks,

To provide MWI, * will send out a sip:notify message to the UA.

The originator of this message is asterisk, as shown below;

NOTIFY sip:1001 at www.mysipproxy.com:5065 SIP/2.0
Via: SIP/2.0/UDP 66.121.xxx.yyy:5060;branch=z9hG4bK0466cb21
From: "asterisk" <sip:asterisk at 66.121.xxx.yyy>;tag=as0ffb1bdc
<===============
To: <sip:1001 at www.mysipproxy.com:5065>
Contact: <sip:asterisk at 66.121.xxx.yyy>
Call-ID: 6fa70c151dce64a339367cc2612c9f87 at 66.121.xxx.yyy
CSeq: 102 NOTIFY
User-Agent: Asterisk PBX
Event: message-summary
Content-Type: application/simple-message-summary
Content-Length: 38

Messages-Waiting: yes
Voicemail: 4/11

Is there a way that I can change this 'originator' to a numeric value ?

Cheers

SW