Viking Door Intercom Connecting to ATA190

[SLKK64593]

I have a analog Viking W-1000 intercom connected to ATA-190 box, then into Call Manager. Partition, CSS, etc have been set up, and for testing purpose, when an analog phone is connected to the ATA, once the handset is offhook, it immediately places a call to a specific number (front desk). And two-way voice communication is established. 

However, when connected the W-1000 to the ATA, when the call button of the intercom is pressed (offhook), it rings (generates standard ring condence) and places a call to front desk. But the problem is, the call drops between each ring. And when the front desk phone is picked up, the W-1000 keeps ringing. It seems like Call Manger or the ATA considers each ring as a separate call instead of a tone of waiting for pick up.

Any idea what's wrong?

[pieterh]

check the manual of the door-intercom, this does not have a handset that goes off-hook but only a button?

you may need to keep the button pressed while the call lastst !!!

of course this not very user friendly

[pieterh]

in addititon, the manual reads:

Do NOT install a W-1000,W-2000A or W-3000 on a telephone line without a C-1000B

do you have a C-1000B connected?