voila ce que j'ai avec sip debug sur le fournisseur et le téléphone concerné :

Code:
<--- SIP read from UDP:192.168.1.20:5060 --->
REGISTER sip:192.168.1.10 SIP/2.0
Via: SIP/2.0/UDP 192.168.1.20:5060;branch=z9hG4bK7661e6afeb5feb59aa739d1eb44f4d7;rport
From: "kalidev1" <sip:kalidev1@192.168.1.10>;tag=1694489133
To: "kalidev1" <sip:kalidev1@192.168.1.10>
Call-ID: 2652774740@192_168_1_20
CSeq: 10999 REGISTER
Contact: <sip:kalidev1@192.168.1.20:5060>
Max-Forwards: 70
User-Agent: A580 IP021920000000
Expires: 180
Allow: INVITE, ACK, CANCEL, BYE, OPTIONS, INFO, REFER, SUBSCRIBE, NOTIFY
Content-Length: 0


<------------->
--- (12 headers 0 lines) ---
Sending to 192.168.1.20 : 5060 (no NAT)

<--- Transmitting (no NAT) to 192.168.1.20:5060 --->
SIP/2.0 401 Unauthorized
Via: SIP/2.0/UDP 192.168.1.20:5060;branch=z9hG4bK7661e6afeb5feb59aa739d1eb44f4d7;received=192.168.1.20;rport=5060
From: "kalidev1" <sip:kalidev1@192.168.1.10>;tag=1694489133
To: "kalidev1" <sip:kalidev1@192.168.1.10>;tag=as79e3afc6
Call-ID: 2652774740@192_168_1_20
CSeq: 10999 REGISTER
Server: Asterisk PBX 1.6.2.9-2
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO
Supported: replaces, timer
WWW-Authenticate: Digest algorithm=MD5, realm="asterisk", nonce="62adcae5"
Content-Length: 0


<------------>
Scheduling destruction of SIP dialog '2652774740@192_168_1_20' in 32000 ms (Method: REGISTER)

<--- SIP read from UDP:192.168.1.20:5060 --->
REGISTER sip:192.168.1.10 SIP/2.0
Via: SIP/2.0/UDP 192.168.1.20:5060;branch=z9hG4bK6cb7fd43a5a990958942e8acefbc9068;rport
From: "kalidev1" <sip:kalidev1@192.168.1.10>;tag=1694489133
To: "kalidev1" <sip:kalidev1@192.168.1.10>
Call-ID: 2652774740@192_168_1_20
CSeq: 11000 REGISTER
Contact: <sip:kalidev1@192.168.1.20:5060>
Authorization: Digest username="kalidev1", realm="asterisk", algorithm=MD5, uri="sip:192.168.1.10", nonce="62adcae5", response="5454a87e3f25dee5e45d95aaacd0e2cc"
Max-Forwards: 70
User-Agent: A580 IP021920000000
Expires: 180
Allow: INVITE, ACK, CANCEL, BYE, OPTIONS, INFO, REFER, SUBSCRIBE, NOTIFY
Content-Length: 0


<------------->
--- (13 headers 0 lines) ---
Sending to 192.168.1.20 : 5060 (no NAT)

<--- Transmitting (no NAT) to 192.168.1.20:5060 --->
SIP/2.0 200 OK
Via: SIP/2.0/UDP 192.168.1.20:5060;branch=z9hG4bK6cb7fd43a5a990958942e8acefbc9068;received=192.168.1.20;rport=5060
From: "kalidev1" <sip:kalidev1@192.168.1.10>;tag=1694489133
To: "kalidev1" <sip:kalidev1@192.168.1.10>;tag=as79e3afc6
Call-ID: 2652774740@192_168_1_20
CSeq: 11000 REGISTER
Server: Asterisk PBX 1.6.2.9-2
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO
Supported: replaces, timer
Expires: 180
Contact: <sip:kalidev1@192.168.1.20:5060>;expires=180
Date: Tue, 22 Mar 2011 09:44:48 GMT
Content-Length: 0


<------------>
Scheduling destruction of SIP dialog '2652774740@192_168_1_20' in 32000 ms (Method: REGISTER)

<--- SIP read from UDP:192.168.1.20:5060 --->
REGISTER sip:192.168.1.10 SIP/2.0
Via: SIP/2.0/UDP 192.168.1.20:5060;branch=z9hG4bK3e8ec846d6facef21f0a2dd424d323d9;rport
From: "kalidev 2" <sip:kalidev2@192.168.1.10>;tag=260232850
To: "kalidev 2" <sip:kalidev2@192.168.1.10>
Call-ID: 1219423529@192_168_1_20
CSeq: 13700 REGISTER
Contact: <sip:kalidev2@192.168.1.20:5060>
Max-Forwards: 70
User-Agent: A580 IP021920000000
Expires: 180
Allow: INVITE, ACK, CANCEL, BYE, OPTIONS, INFO, REFER, SUBSCRIBE, NOTIFY
Content-Length: 0


<------------->
--- (12 headers 0 lines) ---
Sending to 192.168.1.20 : 5060 (no NAT)

<--- Transmitting (no NAT) to 192.168.1.20:5060 --->
SIP/2.0 401 Unauthorized
Via: SIP/2.0/UDP 192.168.1.20:5060;branch=z9hG4bK3e8ec846d6facef21f0a2dd424d323d9;received=192.168.1.20;rport=5060
From: "kalidev 2" <sip:kalidev2@192.168.1.10>;tag=260232850
To: "kalidev 2" <sip:kalidev2@192.168.1.10>;tag=as7b678c2d
Call-ID: 1219423529@192_168_1_20
CSeq: 13700 REGISTER
Server: Asterisk PBX 1.6.2.9-2
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO
Supported: replaces, timer
WWW-Authenticate: Digest algorithm=MD5, realm="asterisk", nonce="15f2f0d7"
Content-Length: 0


<------------>
Scheduling destruction of SIP dialog '1219423529@192_168_1_20' in 32000 ms (Method: REGISTER)

<--- SIP read from UDP:192.168.1.20:5060 --->
REGISTER sip:192.168.1.10 SIP/2.0
Via: SIP/2.0/UDP 192.168.1.20:5060;branch=z9hG4bK74c89957c85cc131509a64262982de0e;rport
From: "kalidev 2" <sip:kalidev2@192.168.1.10>;tag=260232850
To: "kalidev 2" <sip:kalidev2@192.168.1.10>
Call-ID: 1219423529@192_168_1_20
CSeq: 13701 REGISTER
Contact: <sip:kalidev2@192.168.1.20:5060>
Authorization: Digest username="kalidev2", realm="asterisk", algorithm=MD5, uri="sip:192.168.1.10", nonce="15f2f0d7", response="6a14cf5a06890be3d48d57d27ac466d6"
Max-Forwards: 70
User-Agent: A580 IP021920000000
Expires: 180
Allow: INVITE, ACK, CANCEL, BYE, OPTIONS, INFO, REFER, SUBSCRIBE, NOTIFY
Content-Length: 0


<------------->
--- (13 headers 0 lines) ---
Sending to 192.168.1.20 : 5060 (no NAT)

<--- Transmitting (no NAT) to 192.168.1.20:5060 --->
SIP/2.0 200 OK
Via: SIP/2.0/UDP 192.168.1.20:5060;branch=z9hG4bK74c89957c85cc131509a64262982de0e;received=192.168.1.20;rport=5060
From: "kalidev 2" <sip:kalidev2@192.168.1.10>;tag=260232850
To: "kalidev 2" <sip:kalidev2@192.168.1.10>;tag=as7b678c2d
Call-ID: 1219423529@192_168_1_20
CSeq: 13701 REGISTER
Server: Asterisk PBX 1.6.2.9-2
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO
Supported: replaces, timer
Expires: 180
Contact: <sip:kalidev2@192.168.1.20:5060>;expires=180
Date: Tue, 22 Mar 2011 09:44:48 GMT
Content-Length: 0


<------------>
Scheduling destruction of SIP dialog '1219423529@192_168_1_20' in 32000 ms (Method: REGISTER)
prodserver*CLI>