Incoming calls are being dropped

@Bradbpw wrote:

I have about 3-4 calls per day (maybe 10% of our calls) that drop right as I pick them up. They are usually local numbers. I can't find out why they are dropping, the only warnings I get in my log are:

WARNING[8527][C-00003960] func_channel.c: Unknown or unavailable item requested: 'reversecharge'
WARNING[8527][C-00003960] app_dial.c: Unable to create channel of type 'SIP' (cause 20 - Subscriber absent)

We do receive other calls from random numbers that drop or are telemarketing. So I'm wondering if this is a telemarketer or something else that is just masking their number to be local or if this is a client trying to reach us. Any ideas what is causing this?

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