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Linksys SPA9000 Administrator Guide
Document Version 3.01
Chapter 4 Configuring SPA9000 Features
Managing Call Forwarding
Max-Forwards: 70
Contact: “User-A” <sip:5041@192.168.0.4:5061>Event: dialog Content-Length: 408
Content-Type: application/dialog-info+xml
<?xml version=”1.0”?>
<dialog-info xmlns=”urn:ietf:params:xml:ns:dialog-info” version=”0” state=”partial”
entity=”sip:5031@192.168.0.1:6060”>
<dialog id=”201” direction=”initiator”>
<local>
<identity display=”User-A”>sip:5031@192.168.0.1:6060</identity>
<target uri=”sip:5031@192.168.0.1:6060”>
<param pname=”x-line-id” pvalue=”0”/>
</target>
</local>
<state>trying</state>
</dialog>
</dialog-info>
2. The SPA9000 grants the line seize request by replying 202 (because no one else is using that line
key):
SIP/2.0 202 Accepted
To: “User-A” <sip:5041@192.168.0.1:6060>;tag=41a7-0
From: “User-A” <sip:5031@192.168.0.1:6060>;tag=e676b37bae382029o1
Call-ID: 942395ba-dfdc1193@192.168.0.4
CSeq: 6583 NOTIFY
Via: SIP/2.0/UDP 192.168.0.4:5061;branch=z9hG4bK-55f99f8e
Server: Sipura/SPA2100-3.1.5(a)
Content-Length: 0
3. The SPA9000 notifies other client stations sharing the line key on the shared extension:
NOTIFY sip:5041@192.168.0.6:5060 SIP/2.0
Via: SIP/2.0/UDP 192.168.0.1:6060;branch=z9hG4bK-1cae6e99
From: PBX Line 1 <sip:37683101@matrix.sipura.com>;tag=5080117180da6835o2
To: <sip:5041@192.168.0.6:5060>
Call-ID: 3ecb02c9-250f41cd@localhost
CSeq: 56195 NOTIFYMax-Forwards: 70Event: dialog
Content-Length: 397
Content-Type: application/dialog-info+xml
<?xml version=”1.0”?>
<dialog-info xmlns=”urn:ietf:params:xml:ns:dialog-info” version=”31” state=”partial”
entity=”sa@192.168.0.1:6060”> <dialog id=”201” direction=”initiator”>
<local>
<identity display=”User-A”>sip:5031@192.168.0.1:6060</identity>
<target uri=”sip:5031@192.168.0.1:6060”>
<param pname=”x-line-id” pvalue=”0”/>
</target>
</local>
<state>trying</state>
</dialog>
</dialog-info>
When a client station sends the initial NOTIFY to the SPA9000, all the line key resources allocated to
this station, if any, are released immediately to avoid locking up of line keys because of client reboot.
The same is done when the registration of the client station expires.
Note that the SPA9000 assumes all partial-state dialog-info and contains only one dialog.