[Asterisk-Users] cascaded ringing

[Elmar Haneke]

Hi,

I intend to let several SIP-phones on my asterisk ring cascaded on 
incoming calls.

First only phone 1 should ring, after 5 seconds phone 2 should ring in 
addition and after additional 5 Seconds phone 3 should also ring.

How can I realize that correctly?

Currently I do use
	Dial(SIP/1,5)
	Dial(SIP/1&SIP/2,5)
	Dial(SIP&1&SIP/2&SIP/3)

But this seems not to work correctly on phone 1 since the ringing is 
interrupted twice.

Is there an better way to implement this feature in an single Dial 
command?

Elmar