Forwarding issues

[BTU789]

My customer has an PACS R7.0 91E with a 308 EC and a large pc card voicemail in a 5 slot carrier. They have 8 POTS lines programmed onto the phones. Three phones are currently using the forward feature when the user is out of the office. One out of the three is forwarded 95% of the time. Recently I was asked to forward ext. 10 to their NY office. When ext. 10 has the forward feature activated; the ext. that is forwarded 95% of the time gets a fast busy when a call is made to that ext.
So, Basically, a call comes in, AA picks up, you dial the ext (in this case ext 17) AA transfers the call, then you hear a fast busy. This is happening when all 8 lines are free. When I unforward ext 10, everything works the way it should.
Any insight to this would be appreciated. I've tried all the troubleshooting I can think of except for programming the whole switch from scratch.
Thanks.

 

[mforrence]

Can you replicate while on site? Is fast busy coming from telco? You MAY need a pause as first digit of outgoing number in order for telco to collect all of the digits properly.
Mike

 

[Westi]

try to make sure that the Auto LIne select selects all lines and not only a few of the 8 lines you have

Joe W.

FHandw., ACS

I don't suffer from insanity
I enjoy every moment of it

 

[BTU789]

Mforrence- I haven't been back to the site yet. But, when I call there and get transferred to ext 17 I get the fast busy. When the ext 10 forward is removed I don't get a fast busy. I'll try the pause next time I go there.
Westi- I'll try your suggestion also. Never thought I would need to do that.
Thank you both for your input. I'll update this further when I make it out to the site.
Brian