MWI "Notify" Error

Hi Guys,

I,m having problems configuring MWI on my Audiocodes MP-124 FXS. When my Asterisks send the “Notify” command to the Audiocodes, It responds with a "481 Call/Transaction Does Not Exist"
I?m using Asterisk 1.2.9.1.

This is an example of a trace:

BYE sip:8150@192.168.2.100 SIP/2.0
Via: SIP/2.0/UDP 192.168.2.0:5061;branch=z9hG4bK-5270469
From: mguelar sip:8017@192.168.2.100;tag=daac1d698be52526o1
To: sip:8150@192.168.2.100;tag=as07db8535
Call-ID: c39f78e5-c5af1fda@192.168.2.0
CSeq: 103 BYE
Max-Forwards: 70
Proxy-Authorization: Digest username=“8017”,realm=“asterisk”,nonce=“342048e4”,uri="sip:8150@192.168.2.100",algorithm=MD5,response="b229de36cbfcd8003139d5966ea4ea01"
User-Agent: Linksys/PAP2-3.1.9(LSc)
Content-Length: 0

— (10 headers 0 lines)—
Sending to 192.168.2.0 : 5061 (non-NAT)
Transmitting (no NAT) to 192.168.2.0:5061:
SIP/2.0 200 OK
Via: SIP/2.0/UDP 192.168.2.0:5061;branch=z9hG4bK-5270469;received=192.168.2.0
From: mguelar sip:8017@192.168.2.100;tag=daac1d698be52526o1
To: sip:8150@192.168.2.100;tag=as07db8535
Call-ID: c39f78e5-c5af1fda@192.168.2.0
CSeq: 103 BYE
User-Agent: Asterisk PBX
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Contact: sip:8150@192.168.2.100
Content-Length: 0


-- User hung up

Destroying call 'c39f78e5-c5af1fda@192.168.2.0’
12 headers, 3 lines
Reliably Transmitting (no NAT) to 192.168.100.1:5060:
NOTIFY sip:8150@192.168.100.1 SIP/2.0
Via: SIP/2.0/UDP 192.168.2.100:5060;branch=z9hG4bK34f0ad27
From: “Unknown” sip:Unknown@192.168.2.100;tag=as4d535681
To: sip:8150@192.168.100.1
Contact: sip:Unknown@192.168.2.100
Call-ID: 5393f3e0681150a54fcc679a4b43084a@192.168.2.100
CSeq: 102 NOTIFY
User-Agent: Asterisk PBX
Max-Forwards: 70
Event: message-summary
Content-Type: application/simple-message-summary
Content-Length: 94

Messages-Waiting: yes
Message-Account: sip:asterisk@192.168.2.100
Voice-Message: 5/0 (0/0)


Scheduling destruction of call ‘5393f3e0681150a54fcc679a4b43084a@192.168.2.100’ in 15000 ms
asterisk1*CLI>
<-- SIP read from 192.168.100.1:5060:
SIP/2.0 481 Call/Transaction Does Not Exist
Via: SIP/2.0/UDP 192.168.2.100:5060;branch=z9hG4bK34f0ad27
From: “Unknown” sip:Unknown@192.168.2.100;tag=as4d535681
To: sip:8150@192.168.100.1;tag=1c2069389830
Call-ID: 5393f3e0681150a54fcc679a4b43084a@192.168.2.100
CSeq: 102 NOTIFY
Contact: sip:192.168.100.1
Supported: em,timer,replaces,path
Allow: REGISTER,OPTIONS,INVITE,ACK,CANCEL,BYE,NOTIFY,PRACK,REFER,INFO,SUBSCRIBE,UPDATE
Content-Length: 0

— (10 headers 0 lines)—
Got SIP response 481 “Call/Transaction Does Not Exist” back from 192.168.100.1Destroying call '5393f3e0681150a54fcc679a4b43084a@192.168.2.100’
asterisk1*CLI>

Do you know what might be the problem. I?m also using a Linksys PAP2 and is working fine.

Regards,

Mariano