I work for a charity in the UK.
We currently have two buildings, each with a Toshiba CTX PBX . These two buildings are connected via an 11MB radio link and Q sig enables the two phone systems to integrate, allowing our receptionist at the main site to handle / view all the call activity.
The staff at the second building make and receive external calls via the ISDN installed at the main building.
The radio link is also used for computer data traffic.
The system works well a lot of the time. However there is an intermittent problem with calls cutting off at the second site. The usual scenario is that the call will end shorlty after the connection has been made. The phone will ring but then cut to an engaged tone - 'call abandoned' will appear on the handset display. If an attempt to call the same number is made within a few minutes the same problem usually occurs. However, on another occasion the number can be contacted without problem.
This problem seems to be mostly restricted to outgoing external calls. Calls made between sites to internal extensions are OK.
As these 'internal' calls are OK it would seem that the problem is not with the link. Voice prioritisation has been implemented and we have no problem with the quality of calls.
If anyone can shed any light on this it would be much appreciated.