Description

If this setting is set to off, the phone accepts Check-Sync requests without requesting authentication. 
Example SIP flow without challenge

Received from Udp:192.168.137.1:39335 on Udp: at Aug 15 22:23:37.602 (271 bytes):
 
NOTIFY sip:340899@192.168.137.181:5305 SIP/2.0
Via: SIP/2.0/UDP 192.168.137.1:55561;branch=z9hG4bK.22fe21d5;rport;alias
To: sip:340899@192.168.137.181:5305
From: sip:sipsak@192.168.137.1
CSeq: 10 NOTIFY
Call-ID: 1234@192.168.137.1
Event: check-sync;reboot=false
 
Sent to Udp:192.168.137.1:39335 from Udp:192.168.137.181:53057 at Aug 15 22:23:37.613 (267 bytes):
 
SIP/2.0 200 Ok
Via: SIP/2.0/UDP 192.168.137.1:55561;branch=z9hG4bK.22fe21d5;rport=39335;alias
From: sip:sipsak@192.168.137.1
To: <sip:340899@192.168.137.181:5305>
Call-ID: 1234@192.168.137.1
CSeq: 10 NOTIFY
User-Agent: gigasetP710/10.1.39.11
Content-Length: 0


Turning this setting on enables challenge responses for Check-Sync requests. The phone will send a 401 Unauthorized reply back to the sender and expect a new Check-Sync request with the Authorization header. The authentication password is the same as the SIP password set on the respective identity.  
Example SIP flow with challenge

Received from Udp:192.168.137.1:46718 on Udp: at Aug 15 22:22:29.156 (271 bytes):
 
NOTIFY sip:340899@192.168.137.181:5305 SIP/2.0
Via: SIP/2.0/UDP 192.168.137.1:49894;branch=z9hG4bK.4ddbb535;rport;alias
To: sip:340899@192.168.137.181:5305
From: sip:sipsak@192.168.137.1
CSeq: 10 NOTIFY
Call-ID: 1234@192.168.137.1
Event: check-sync;reboot=false
 
Sent to Udp:192.168.137.1:46718 from Udp:192.168.137.181:53057 at Aug 15 22:22:29.159 (372 bytes):
 
SIP/2.0 401 Unauthorized
Via: SIP/2.0/UDP 192.168.137.1:49894;branch=z9hG4bK.4ddbb535;rport=46718;alias
From: sip:sipsak@192.168.137.1
To: <sip:340899@192.168.137.181:5305>
Call-ID: 1234@192.168.137.1
CSeq: 10 NOTIFY
User-Agent: gigasetP710/10.1.39.11
WWW-Authenticate: Digest realm="gigaset.com", nonce="b5e73bf9ef0fc8b2", algorithm=MD5
Content-Length: 0
 
Received from Udp:192.168.137.1:46718 on Udp:192.168.137.181:53057 at Aug 15 22:22:29.170 (466 bytes):
 
NOTIFY sip:340899@192.168.137.181:5305 SIP/2.0
Authorization: Digest username="340899", uri="sip:340899@192.168.137.181:5305", algorithm=MD5, realm="gigaset.com", nonce="b5e73bf9ef0fc8b2", response="f10d6c2cc255089c948c58c14ed0b44f"
Via: SIP/2.0/UDP 192.168.137.1:49894;branch=z9hG4bK.7fcb1e87;rport;alias
To: sip:340899@192.168.137.181:5305
From: sip:sipsak@192.168.137.1
CSeq: 11 NOTIFY
Call-ID: 1234@192.168.137.1
Event: check-sync;reboot=false
 
Sent to Udp:192.168.137.1:46718 from Udp:192.168.137.181:53057 at Aug 15 22:22:29.178 (267 bytes):
 
SIP/2.0 200 Ok
Via: SIP/2.0/UDP 192.168.137.1:49894;branch=z9hG4bK.7fcb1e87;rport=46718;alias
From: sip:sipsak@192.168.137.1
To: <sip:340899@192.168.137.181:5305>
Call-ID: 1234@192.168.137.1
CSeq: 11 NOTIFY
User-Agent: gigasetP710/10.1.39.11
Content-Length: 0



Web User Interface

Advanced → QoS/Security (Tab) → Security(Section) → Authentication for SIP Check-Sync


Phone User Interface

N/A


Auto-provisioning

ParameterValid value
<challenge_checksync perm="PERMISSIONFLAGS">VALIDVALUE</challenge_checksync><on>, <off>