[Asterisk-Users] Delayed ringing on some SIP phones

[Chris Bagnall]

Hello all,

One of the buildings I have an asterisk box deployed in is used by two small
companies on two floors. They have an agreement between them whereby they'll
answer each other's incoming calls and take messages if the office is empty
/ everyone is on the phone.

Each of them has an  ISDN BRI delivered to asterisk via zaphfc, then dropped
into a context as follows:
exten => s,1,SetCIDName(Company 1)
exten => s,2,Dial(SIP/200&SIP/201&etc.,30)
exten => s,3,Voicemail(su200)

Each company is able to see on the LCD on their SIP phones whether the call
is for them or the folks up/downstairs.

What I'd like to do is implement a delayed ringing strategy - i.e. if the
call comes in for Company 1, only their SIP phones will ring for the first
15 seconds, then if there's not been an answer, company 2's SIP phones will
also start ringing.

Is there any way to do this without stopping Company 1's phones ringing
(i.e. timing out the dial statement after 15 seconds)?

Thanks in advance.

Regards,

Chris
-- 
C.M. Bagnall, Director, Minotaur I.T. Limited
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