exten => 100,hint,SIP/peername

Specific Phone Configuration

Polycom Phones (updated for 3.2.X firmware with asterisk 1.6.1 Jan/2010)

With SIP 3.2.X firmware (available on the Polycom download site) and Asterisk 1.6.1, Polycom phones now support a full featured BLF showing statuses of Ringing, Inuse and Online and one touch directed call pickup.
On the asterisk side all that needs to be done is to add a hint to the extension. On the phone side for each line that is going to be monitored add lines like the following to the phone's cfg file.
            attendant.reg="1"
            attendant.resourceList.1.address="sip:205@192.168.1.102"
            attendant.resourceList.1.label="205" 
            attendant.resourceList.2.address="sip:217@192.168.1.102"
            attendant.resourceList.2.label="217"
Assuming my server is at 192.168.1.102, this will add two BLF lines to the phone for extensions 205 and 217. Calls incoming to those extensions will show a blinking green led on the monitoring phone, pressing the hard key will pick the call up, if it is answered elsewhere the led will change to solid red. AFAIK this cannot be configured via the phones web gui, you must use the cfg files. You can also use versions of Asterisk older than 1.6.1 if you remove the restriction on what asterisk thinks Polycom phones can handle. Look in chan_sip.c for
                 if (strstr(p->useragent, "Polycom")) {
                   p->subscribed = XPIDF_XML;
and change that line to
                   p->subscribed = DIALOG_INFO_XML;

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To enable presence on the Polycom phones you must add a contact to the contact directory. The CONTACT parameter must match the extension of the phone you wish to monitor and the WATCH BUDDY parameter must be set to "enabled". Also, make sure that the first line of the Polycom is registred with your Asterisk server. Polycom tends to use the configuration from the first line for all subscriptions.

With SIP v1.5.2, The Polycom phones may "forget" their subscription for presence information, and return a 450 error to the presence notification. There is no indication on the phone that this has happened, except that the buddy status no longer changes. The only workarounds is to this is to reboot the phone or toggle the WATCH BUDDY parameter to disabled, then to enabled. This bug does not affect other operations on the phone.

Note: There is a quoted limit of 8 (I've found an actual limit of 7) watchable buddies, so if you go to buy the attendant console solution, don't expect to be able to monitor more than 7 other extensions. (see below)

Note: As of firmware version 1.6.6 the limit has been raised on the 601 to 48 watchable buddies. Still 8 on the 501s tho. Yay polycom!

exten => 701,1,ParkedCall(701)
exten => 701,hint,Local/701@ParkedCalls

include => parkedcalls

exten => 701,1,ParkedCall(701)
exten => 701,hint,park:701@parkedcalls