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Faint ringing heard throughout call on Trixbox 2.8.

We have a Trixbox 2.8 box running Asterisk 1.6 and sometimes when a call comes in, the person taking the call will hear a continues faint ringing in the background through the duration of the call.  We are using a SIP trunk through bandwidth.com and have sent packet captures to them.  They say that it's nothing on their end and are pointing the finger at Asterisk.  The problem only appears to happen for a few of the employees, and it is completely random.  The employees are using Polycom IP 550 telephones.

We've updated components by running yum update, re-wired ethernet cables so that the phones go directly into the switch, replaced the switch, replaced the router, removed the "r" option from the inbound trunk options, and replaced the ring group with an IVR.  None of these have fixed the issue.  From what I've seen, no one has heard of anything like this.  Does anyone have any ideas on what I can try next?

Thank you
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OAC Technology
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OAC Technology
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eeRootCommented:
Is you system entirely IP based, or is there any analog in use anywhere?  Do the extensions/lines that are having this problem have any hunting, call forwarding, call rollover, or call re-routing set on them?  Perhaps the incoming caller is somehow hearing the phone system's attempts to find the right extension, or even a cell phone, to forward the call to even though the call has been picked up.

Since it doesn't happen on every extension or every call, it's probably not a global system setting, but rather something to do the particular extensions that are having this problem.  Are you able to identify which numbers are being dialed by the outside callers and then see if those numbers have any settings that are different than the ones that are not having this problem?
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OAC TechnologyProfessional NerdsAuthor Commented:
The system is entirely IP based, there are no analog lines or analog cards in it at all. The lines do not have any forwarding or hunting enabled on them.

The faint ringing happens randomly with different numbers calling in.  I've found no pattern or regulatirty to the problem.  
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OAC TechnologyProfessional NerdsAuthor Commented:
Any ideas on this one?  
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OAC TechnologyProfessional NerdsAuthor Commented:
Found the problem.  It is a problem with the Polycom 3.2 firmware.  I have updated to 3.4 and have not had the issue since.
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OAC TechnologyProfessional NerdsAuthor Commented:
Found solution
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