asterisk users - May 2005 - Group dial, first phone cannot pickup call. Cisco 7905 hangs.

I have a simple dial plan to cascade calls when the first phone does not
answer:

exten => 100,1,Dial(SIP/1000,10,tr)
exten => 100,2,Dial(SIP/1000&SIP/1001,10,tr)
exten => 100,3,Dial(SIP/1000&SIP/1001&SIP/1002,10,tr)
exten => 100,4,Voicemail(u100)

Problem is that the once the call goes onto the second and subsequent
steps exten 1000 cannot answer the call. When the user picks up the
phone it is just dead, no dial tone, nothing. Occasionally the handset
will hang and need to be power-cycled. I've swapped out the phone, the
power supply, and even the cabling, but no joy. 

As long as exten 1000 picks up the call at step one everything works
fine.

Apart from that everything else seems tickety-boo.

Cisco 7905s with latest SIP build and Asterisk CVS-HEAD-03/02/05

I've tried it on another system and can reproduce the fault at will. It
would seem that the first Dial command is not terminated when the second
Dial includes the first extension. 

e.g.

exten => 100,1,Dial(SIP/1001,10,tr)
exten => 100,2,Dial(SIP/1002,10,tr)
exten => 100,3,Dial(SIP/1003,10,tr)

Will do exactly what you'd expect, dials exten 1001 for 10 secs, then
1002 for 10 secs, and finally 1003 for 10 secs. However once you add
extra extensions it all goes horribly wrong.

e.g.

exten => 100,1,Dial(SIP/1001,10,tr)
exten => 100,2,Dial(SIP/1002&SIP/1003,10,tr)

This does what is expected, after ringing extension 1001 for 10 secs
extensions 1002 & 1003 start ringing and the first one to answer gets
the call where upon the second one stops ringing. However the following
is nastier:

exten => 100,1,Dial(SIP/1001,10,tr)
exten => 100,2,Dial(SIP/1001&SIP/1003,10,tr)

After ringing extension 1001 for 10 secs extensions 1001 and 1003 start
ringing but only extension 1003 can pickup the call. If extension 1001
is picked up after extension 1003 has started ringing it is dead as a
dodo. 

Is a bug or a feature?

On Tue, 2005-05-10 at 09:46, bam wrote:
> I have a simple dial plan to cascade calls when the first phone does not
> answer:
> 
> exten => 100,1,Dial(SIP/1000,10,tr)
> exten => 100,2,Dial(SIP/1000&SIP/1001,10,tr)
> exten => 100,3,Dial(SIP/1000&SIP/1001&SIP/1002,10,tr)
> exten => 100,4,Voicemail(u100)
> 
> Problem is that the once the call goes onto the second and subsequent
> steps exten 1000 cannot answer the call. When the user picks up the
> phone it is just dead, no dial tone, nothing. Occasionally the handset
> will hang and need to be power-cycled. I've swapped out the phone, the
> power supply, and even the cabling, but no joy. 
> 
> As long as exten 1000 picks up the call at step one everything works
> fine.
> 
> Apart from that everything else seems tickety-boo.
> 
> Cisco 7905s with latest SIP build and Asterisk CVS-HEAD-03/02/05
> 
> 
> 
> 
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