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Showing articles from Dropped Calls tag

Calls drop after 1-2 hours on every call

# Problem: Calls drop at the same time, every time. I.e after 1 hour or most often 2 hours. # Solution: Most PBX's have a max call duration (default setting 120 minutes) to help prevent toll fraud. You will have to locate this setting and increase the call duration. Or be aware of this setting and place your call a…

Dropped calls when using a Juniper firewall

Calls can be dropped about 30s or 15m into a call across our Juniper firewall. This is due to the ALG (application layer gateway) service for SIP not handling packets properly. When we send a SIP re-invite, the remote VoIP gateway responds with the proper 200/OK; however, the Juniper firewall drops the 200 response an…

Call drop with Epygi PBX

Epygi SIP PBX system enables a SIP Session Timer on a subscriber by default. This session timer acts somewhat as a keep-alive for the phone call. Our switch will either not reply to this or not respond quick enough. To fix this, disable the session timers on all subscribers that are peered to Thinktel. Our switch main…

Calls are Dropping after a few seconds of being answered

This may indicate that the phone is not reregistering on its set interval with the Thinktel switch (3600s). The switch will assume that the device is no longer present and will drop any calls that may be in progress. * Verify the latest firmware is being run on the phone/adapter. * If you are running your phone b…

Dropped calls when using a Sonicwall 2040

If you are experiencing dropped calls, this is probably the result of SIP ALG (application layer gateway) functionality being active. Basically, the firewall is mangling SIP packets, of which our switch rejects. Often by cancelling the phone call. To fix this, disable the "Enable SIP Transformations" option in the VO…

Call are Dropping but only sometimes

This may indicate that the phone is not reregistering on its set interval with the Thinktel switch (3600s). The switch will assume that the device is no longer present and will drop any calls that may be in progress. * Verify the latest firmware is being run on the phone/adapter. * If you are running your phone b…

Calls drop 30 seconds into call

This may occur if you are using an ATA or IP Phone peered directly to Thinktel's switch. What happens is our switch sends a SIP 'keep alive' every 30 seconds to make sure the call is still active. It does this by sending a SIP re-invite for the live call, in which we expect a 200 OK response, that we then ACK back. I…

Calls drop 50 minutes into a call.

This may occur if we don't get a response to our 'keep-alive' What happens is our switch sends a SIP 'keep-alive' after 50 minutes to make sure the call is still active. It does this by sending a SIP reINVITE for the live call, in which we expect a 200 OK response, that we then ACK back. If no response is received, t…

Calls drop 15 minutes into call

If you are a SIP trunk client and are dropping audio in your call after approximately 15 minutes, you may not be responding to the SIP re-INVITE. Our switch performs a SIP re-INVITE every 15 minutes for any active calls in your SIP Trunk. It's a way of checking if the call is indeed still active. If an appropriate 200…

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