Bridged Line Appearance on snom phones.pdf - snom technology AG

snom 360/320 <strong>Bridged</strong> <strong>Line</strong> <strong>Appearance</strong>
The <strong>Bridged</strong> <strong>Line</strong> <strong>Appearance</strong> (BLA) feature allows subscribers to share SIP lines and
also provides status monitoring of the shared line. The BLA feature is commonly offered
in the IP Centrex services and IP-PBX offerings. When a user places an outgoing call
using such an appearance, all members belonging to that particular BLA group are
notified of this usage, and are blocked from using this line appearance until the line goes
back to idle state or if the call is placed on hold. Similarly all members of the BLA group
are notified of an incoming call and the call can be picked up on a line appearance
associated with the BLA extension.
This <strong>Bridged</strong>/Shared <strong>Line</strong> <strong>Appearance</strong> (BLA) feature is also available on snom 360/320.
The new feature allows subscribers to share the available SIP lines without running into
deadlock situations. For visual indications, LEDs available on the snom phones indicate
the status of the shared lines and also allow a BLA group member to pickup incoming
calls to the BLA group. When the shared line is occupied by a BLA group member, other
members of the group are blocked from using the line until its status goes back to idle
thus indicating availability. The following screen shots indicate how <strong>Bridged</strong> <strong>Line</strong>s can
be configured on snom phones.
<strong>Line</strong> Settings:
These settings reflect the basic SIP settings for registering the bridged line.
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SIP Settings:
These settings indicate the advanced settings which need to be configured for a bridged
line.
Note: The “Shared <strong>Line</strong>” setting MUST be turned on in order to enable the bridged line
appearance feature for a SIP line.
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Function Key Settings:
BLA members can monitor the status of the bridged line via the Function keys available
on the snom phones. For monitoring the status of a bridged line, the function key must be
configured as a “Shared <strong>Line</strong>” type. In addition, the “Number” must be set to the bridged
line resource URI. Once the phone has registered and subscribed successfully for the
BLA resource, the LED corresponding to the programmed function key indicates the
status of the bridged line. LED “on” indicates the line is in use, while LED “off”
indicates an idle status.
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<strong>Bridged</strong> <strong>Line</strong> Subscription/Notification:
When a BLA member registers for the BLA resource, the State Agent sends a BLA
subscription to the member. The BLA member sends its own status to the notification
agent and also subscribes to the BLA resource itself for monitoring the status of the
shared line. The following SIP trace depicts a BLA resource subscription:
Received from udp:206.229.26.49:9060 at 3/2/2006 03:39:22:515 (617 bytes):
SUBSCRIBE sip:4087661000@192.168.1.134:2100 SIP/2.0
Via: SIP/2.0/UDP
206.229.26.49:5096;branch=z9hG4bK000010e300000007cee51a330000cee51a33000089016210340341
264
Via: SIP/2.0/UDP 206.229.26.51:5096;branch=z9hG4bK1014378165985263
Record-Route:
From: State_Agent ;tag=511619258984691
To:
Call-ID: 86434-1137229931@206.229.26.51
CSeq: 2 SUBSCRIBE
Contact: State_Agent
event: dialog;sla;include-session-description
expires: 3700
Content-Length: 0
Sent to udp:206.229.26.49:5096 at 3/2/2006 03:39:22:593 (512 bytes):
SIP/2.0 200 OK
Via: SIP/2.0/UDP
206.229.26.49:5096;branch=z9hG4bK000010e300000007cee51a330000cee51a33000089016210340341
264
Via: SIP/2.0/UDP 206.229.26.51:5096;branch=z9hG4bK1014378165985263
Record-Route:
From: "State_Agent" ;tag=511619258984691
To: ;tag=mxrutohi9v
Call-ID: 86434-1137229931@206.229.26.51
CSeq: 2 SUBSCRIBE
Contact:
Expires: 3700
Content-Length: 0
Sent to udp:206.229.26.49:9060 at 3/2/2006 03:39:22:734 (759 bytes):
NOTIFY sip:206.229.26.49:9060 SIP/2.0
Via: SIP/2.0/UDP 192.168.1.134:2100;branch=z9hG4bK-2yvh2wkr55ya;rport
Route:
From: ;tag=mxrutohi9v
To: "State_Agent" ;tag=511619258984691
Call-ID: 86434-1137229931@206.229.26.51
CSeq: 1 NOTIFY
Max-Forwards: 70
Contact: ;flow-id=1
Event: dialog;sla;include-session-description
Subscription-State: active
Content-Type: application/dialog-info+xml
Content-Length: 156
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Sent to udp:206.229.26.49:9060 at 3/2/2006 03:39:22:843 (582 bytes):
SUBSCRIBE sip:guid_50b73158-1dd2-11b2-88c4-b03162323164+50b73158@206.229.26.49:5096
SIP/2.0
Via: SIP/2.0/UDP 192.168.1.134:2100;branch=z9hG4bK-kgex912w1b3e;rport
From: ;tag=w1bodf2327
To:
Call-ID: cb60e3431bb7-bcfj6sxyjsl6@snom360-000413231325
CSeq: 1 SUBSCRIBE
Max-Forwards: 70
Contact: ;flow-id=1
Event: dialog;sla;include-session-description
Accept: application/dialog-info+xml
Expires: 3600
Content-Length: 0
Received from udp:206.229.26.49:9060 at 3/2/2006 03:39:24:171 (536 bytes):
SIP/2.0 200 OK
Via: SIP/2.0/UDP 192.168.1.134:2100;branch=z9hG4bK-
2yvh2wkr55ya;rport=2100;received=195.2.174.186
Record-Route:
From: ;tag=mxrutohi9v
To: "State_Agent" ;tag=511619258984691
Call-ID: 86434-1137229931@206.229.26.51
CSeq: 1 NOTIFY
Contact:
allow-events: dialog;sla;include-session-description
Allow: NOTIFY, SUBSCRIBE
Content-Length: 0
Received from udp:206.229.26.49:9060 at 3/2/2006 03:39:24:281 (608 bytes):
SIP/2.0 202 Accepted
Via: SIP/2.0/UDP 192.168.1.134:2100;branch=z9hG4bKkgex912w1b3e;rport=2100;received=195.2.174.186
Record-Route:
From: ;tag=w1bodf2327
To: ;tag=1076438320835203
Call-ID: cb60e3431bb7-bcfj6sxyjsl6@snom360-000413231325
CSeq: 1 SUBSCRIBE
Contact:
allow-events: dialog;sla;include-session-description
expires: 3600
Allow: NOTIFY, SUBSCRIBE
Content-Length: 0
Received from udp:206.229.26.49:9060 at 3/2/2006 03:39:24:328 (910 bytes):
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NOTIFY sip:4087661000@192.168.1.134:2100 SIP/2.0
Via: SIP/2.0/UDP
206.229.26.49:5096;branch=z9hG4bK000010e300000007cee51a330000cee51a33000089016291335912
297
Via: SIP/2.0/UDP 206.229.26.51:5096;branch=z9hG4bK604580781864957
Record-Route:
From: ;tag=1076438320835203
To: ;tag=w1bodf2327
Call-ID: cb60e3431bb7-bcfj6sxyjsl6@snom360-000413231325
CSeq: 2 NOTIFY
Contact:
max-forwards: 70
event: dialog;sla;include-session-description
subscription-state: active
Content-Type: application/dialog-info+xml
Content-Length: 00160
Busy Status Indication:
The following notification from the state agent indicates a seized bridged line:
Received from udp:206.229.26.49:9060 at 3/2/2006 03:48:41:171 (967 bytes):
NOTIFY sip:4087661000@192.168.1.134:2100 SIP/2.0
Via: SIP/2.0/UDP
206.229.26.49:5096;branch=z9hG4bK000010e300000007cee51a330000cee51a33000089016591296756
223
Via: SIP/2.0/UDP 206.229.26.51:5096;branch=z9hG4bK177044948888427
Record-Route:
From: ;tag=1076438320835203
To: ;tag=w1bodf2327
Call-ID: cb60e3431bb7-bcfj6sxyjsl6@snom360-000413231325
CSeq: 5 NOTIFY
Contact:
max-forwards: 70
event: dialog;sla;include-session-description
subscription-state: active
Content-Type: application/dialog-info+xml
Content-Length: 00271
trying
Sent to udp:206.229.26.49:5096 at 3/2/2006 03:48:41:171 (436 bytes):
SIP/2.0 200 Ok
Via: SIP/2.0/UDP
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206.229.26.49:5096;branch=z9hG4bK000010e300000007cee51a330000cee51a33000089016591296756
223
Via: SIP/2.0/UDP 206.229.26.51:5096;branch=z9hG4bK177044948888427
Record-Route:
From: ;tag=1076438320835203
To: ;tag=w1bodf2327
Call-ID: cb60e3431bb7-bcfj6sxyjsl6@snom360-000413231325
CSeq: 5 NOTIFY
Content-Length: 0
Idle Status Indication:
The following notification from the state agent indicates an idle bridged line:
Received from udp:206.229.26.49:9060 at 3/2/2006 03:56:01:140 (1204 bytes):
NOTIFY sip:4087661000@192.168.1.134:2100 SIP/2.0
Via: SIP/2.0/UDP
206.229.26.49:5096;branch=z9hG4bK000010e300000007cee51a330000cee51a3300008901689-
1800127106
Via: SIP/2.0/UDP 206.229.26.51:5096;branch=z9hG4bK1766615073805891
Record-Route:
From: ;tag=1076438320835203
To: ;tag=w1bodf2327
Call-ID: cb60e3431bb7-bcfj6sxyjsl6@snom360-000413231325
CSeq: 8 NOTIFY
Contact:
max-forwards: 70
event: dialog;sla;include-session-description
subscription-state: active
Content-Type: application/dialog-info+xml
Content-Length: 00506
terminated
Sent to udp:206.229.26.49:5096 at 3/2/2006 03:56:01:234 (438 bytes):
SIP/2.0 200 Ok
Via: SIP/2.0/UDP
206.229.26.49:5096;branch=z9hG4bK000010e300000007cee51a330000cee51a3300008901689-
1800127106
Via: SIP/2.0/UDP 206.229.26.51:5096;branch=z9hG4bK1766615073805891
Record-Route:
From: ;tag=1076438320835203
To: ;tag=w1bodf2327
Call-ID: cb60e3431bb7-bcfj6sxyjsl6@snom360-000413231325
CSeq: 8 NOTIFY
Content-Length: 0
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