Chirp on Lines 1 and 3 on BCM50 2

[allaboutphones]

Just installed a used BCM50 rel. 1 software. It had previously been used with a PRI T1. The customer has POTS lines coming off of an Integrated T1, so we added (2) Two Port Analog Trunk Keycodes (to support 4 Analog Lines).

When accessing lines 1 or 3 to make a call, there is a loud chirp when the line initially goes off hook. This does not happen on lines 2 or 4. We rolled lines 2 and 1, and the problem stayed with the port not the line.

Anyone aware of any issues like this and how they can be corrected?

 

[cook1082]

There was an issue with Rel 1 of the analog trunk ports blowing out due to higher voltage on the lines. Resolved with replacing the unit.and protecting the ports.

 

[Merbac]

After replacing the card/module, we've been adding 2 watt, 200 ohm resistors to each line. No problems since.

 

[allaboutphones]

cook1082, Merbac - Thank you. We added an expansion module and 4 port Analog Trumk Module, swung the lines to the module from the processor and no more chirps. The problem is fixed. Thank you for your assistance.