[Asterisk-Users] picking up a ringing extension

[Louis-David Mitterrand]

Hello, 

We are using asterisk 0.4.0 on debian sid with Cisco 7960 and ATA186
phones.

All sip entries have:

callgroup=1
pickupgroup=1

However I am unable to remotely pickup a ringing phone using *8#. I get
fast busy tone. Is there some flag to add in extensions.conf ?

Thanks in advance,