I have a customer with Charter SIP Trunks and a Panasonic NS700. At 15 minutes exactly, the user is unable to hear the other party, but the other party can hear them. BTS believes it to be either a carrier or firewall issue and the carrier believes it to be PBX or Firewall. Charter's SIP Gateway device is installed on the customer's LAN and was provisioned with a local IP address, so I'm not sure that the firewall is even in play? Charter's SIP Gateway must go out via their own coax/fiber, and strictly communicating with the PBX through the LAN switch- but somebody correct me if I am wrong.
We had another customer call who had come to us from a different vendor and they were having the same issue, but with a TDA50. They were looking for a quick fix as they were a small branch of a larger corporation that was soon going to move onto corporate's VOIP system out of state, so we were never able to resolve it with them.
I have to imagine that SOMEONE has gone through this and may be able to let me know what the fix was? Was it Charter/Spectrum? Or PBX? Or some common firewall setting?
The IT guy had been working with Spectrum/Charter up until this point regarding this issue and sent me the following response from Spectrum/Charter:
*** "Traced the call and found that the call is being ended from the customer's direction. This call initially sets up for out of band signaling. At the 15 minute mark when the session timer is invoked from the Voice core, the re-invite still is offering oob signaling.
The customer's PBX answers with a 200ok requesting in-band signaling, The voice core, re-invites with in-band signaling in SDP as requested, phone system 200oks, voice core Acks, then customer side sends the sip BYE message.***
Please let me know if anybody has any information!
Thank you!
We had another customer call who had come to us from a different vendor and they were having the same issue, but with a TDA50. They were looking for a quick fix as they were a small branch of a larger corporation that was soon going to move onto corporate's VOIP system out of state, so we were never able to resolve it with them.
I have to imagine that SOMEONE has gone through this and may be able to let me know what the fix was? Was it Charter/Spectrum? Or PBX? Or some common firewall setting?
The IT guy had been working with Spectrum/Charter up until this point regarding this issue and sent me the following response from Spectrum/Charter:
*** "Traced the call and found that the call is being ended from the customer's direction. This call initially sets up for out of band signaling. At the 15 minute mark when the session timer is invoked from the Voice core, the re-invite still is offering oob signaling.
The customer's PBX answers with a 200ok requesting in-band signaling, The voice core, re-invites with in-band signaling in SDP as requested, phone system 200oks, voice core Acks, then customer side sends the sip BYE message.***
Please let me know if anybody has any information!
Thank you!