[Asterisk-Users] Ring Multiple SIP client at the same time

[Marcello Lupo]

Hi,
i read the * support ringing multiple devices at the same time, i inserted 
this line on my configuration on default context:

exten => s,1,Dial(SIP/260&SIP/261&SIP/262&SIP/263|30)
exten => s,2,Voicemail,u260
exten => s,3,Hangup

And i have both 4 clients in sip.conf .
The problem is that if i call it fall immediately in the Voicemail if the 
client 260 is not registered .
Do you know if there is a way to avoid that and let the system do it only if 
all of 4 clients are not reachable??
Thanks,
BYe,
Marcello