* hint: The 'hint' priority associates an extension with an Asterisk channel for the purpose of mapping the state of the channel to a state of the extension.
In asterisk, a channel (technology/device) can have several states (unavailable, in-use, busy, ringing, etc) but an extension is just a label for a sequence of applications. However, when communicating the state of the channel to an external device, such as a receptionist console, you cannot use the Asterisk internal channel names, but must use an externally identifiable resource name, typically the extension number. A device would then subscribe to the state of the extension of interest and receive status notifications from the supporting technology channel. This is used in the SIP channel (implemented via the SUBSCRIBE/NOTIFY mechanism of RFC-3265) to light up the status lamps on SIP phones. This is supported in SNOM phones (see also) with their programmable keys set to type "destination", as well as in Polycom (500/600), Aastra ( 480i, 9133i ), and Sayson phones. It is also supported in Citel SIP Handset Gateways. Privacy considerations: In sip.conf you can define a subscribecontext= value that determines in which context Asterisk should search for the matching extension when a subscribe request is received from the phone; however, if the extension doesn't exist in that context Asterisk is going to look for it in the default context! In other words: Everyone can subscribe to a "hinted" extension that is defined in the default context. By the way, specifying an empty subscribecontext is also fine if the phone should not at all subscribe to _any_ context. Likewise bug/patch 5515 (post Asterisk 1.2.0) adds devstate support also for MGCP (so far SIP, IAX and ZAP are supported; "show channeltypes" tell you which channels in your Asterisk support device status notification). Question: Does this patch only show a device which is unavailable (e.g. disconnected), or does it also show "busy"? Answer: Also "busy" (in use). Also chan_capi-cm v0.6.2 and later comes with basic hint support. It appears, however, that the dynamic naming of CAPI channels that includes the called number makes monitoring of a CAPI line for outgoing calls practically impossible - at least for now. Note: the 3rd party Bristuff patches come with app_devstate that permits state manipulation through the dialplan. New: While Asterisk 1.6 will include func_devstate natively there is now also a backport available for 1.4. This is quite similar to app_devstate as part of the bristuff patches. Example exten => 200,hint,SIP/phone1 ; this is case sensitive (!) in 1.0.9 and 1.2.0 exten => 200,1,Macro(stdexten,SIP/phone1) If you want to monitor the state of multiple phones using one speeddial, you can do so: exten => 200,hint,SIP/201&SIP/202&SIP/203 Asterisk seems to provide syntax for allowing more than one channel to be mapped to any particular extension with the hint system. Useful CLI commands for debugging are "SIP show subscriptions", "show hints", "show channeltypes" and "SIP show inuse". On Nov 6, 2007 1:36 PM, Alejandro Cabrera Obed <[EMAIL PROTECTED]> wrote: > Dear all, I'm using Asterisk 1.4 as my SIP server of my LAN users. The > SIP clients are using different operating systems such Debian, Gentoo > and Windows XP so they use different SIP softphones like SJPhone, > Twinkle and X-Lite. > > In order to let SIP clients to see the presence status to each other, do > I have to establish any special setting in Asterisk 1.4 ??? Or the > presence status (online, offline, away, etc.) is only up to the SIP > clients and not up to the Asterisk ??? > > Really thanks > > Alejandro > > _______________________________________________ > --Bandwidth and Colocation Provided by http://www.api-digital.com-- > > asterisk-users mailing list > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users > _______________________________________________ --Bandwidth and Colocation Provided by http://www.api-digital.com-- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
