Afaik, Linksys SPA9xx series phones had possibility to subscribe to group on their PBX, SPA9000.
When you press a group pickup soft key you would see a displayed info about who's calling who, and you could intercept the call.

FS only send NOTIFY messages to phones that have subscribed to certain extension, regardless of the call groups (standard rfc 3265 and 4235 type presence). Phones generally light LED buttons in order to display the status of the watched extension. With snom phones I have seen that it's possible to get the display of the call in progress before picking the call up (that's about what you want - A calling B).


On Wed, Nov 7, 2012 at 7:29 AM, sparklezou <sparklezou@163.com> wrote:
Hi Ognjen,
 
I have checked the sip message log. There is NO sip "notification" message or any other kind message to notify all others in the same group.
 
How does FS implement it?
 
Please help on this case.
 
Thanks!
 
2012-11-07
sparklezou
发件人：sparklezou
发送时间：2012-11-06 10:01
主题：Re: Re: Re: [Freeswitch-users] About "Dial Groups" or "Callgroup intercept"
收件人："FreeSWITCH Users Help"<freeswitch-users@lists.freeswitch.org>,"Ognjen Seslija"<oseslija@gmail.com>
抄送："freeswitch-dev"<freeswitch-dev@lists.freeswitch.org>
 
Hi Ognjen,
 
There is a "Notify" message to inform all of the users in the Group? Correct?
 
How implment at FS side?
 
2012-11-06
sparklezou
发件人：sparklezou
发送时间：2012-11-06 09:33
主题：Re: Re: [Freeswitch-users] About "Dial Groups" or "Callgroup intercept"
收件人："FreeSWITCH Users Help"<freeswitch-users@lists.freeswitch.org>,"Ognjen Seslija"<oseslija@gmail.com>
抄送："freeswitch-dev"<freeswitch-dev@lists.freeswitch.org>
 
Hi Ognjen,
 
Could you please provide more info, which kind of phone support such feature?
 
Or it's tested on which kind of phones?
 
Thanks!
 
2012-11-06
sparklezou
发件人：Ognjen Seslija
发送时间：2012-11-06 02:24
主题：Re: [Freeswitch-users] About "Dial Groups" or "Callgroup intercept"
收件人："FreeSWITCH Users Help"<freeswitch-users@lists.freeswitch.org>
抄送："freeswitch-dev"<freeswitch-dev@lists.freeswitch.org>
 
That feature is phone dependent. Afaik it's working on snom, but not on Linksys/Cisco.
FS already sets everything needed.

On Mon, Nov 5, 2012 at 9:54 AM, sparklezou <sparklezou@163.com> wrote:
Hi Sir/Madam,
 
 
And also implement it on FS.
 
Here I want to know, does FS could implement such features? I know such features are working on some digital phone system.
 
1. "KAKA" & "GAGA" are in the same "Dial Groups".
2. When someone inside/outside call "KAKA", there will be visible sentens on the phone LCD of "GAGA", "XXX call KAKA"(inside display the name), "12345678 call KAKA" (outside display the number). 
 
Is it posible to implement?
 
Thanks in advance!
 
2012-11-05
sparklezou

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