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Reliable Inbound Connections


dcjm
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Hello,

I’m having a problem with getting reliable inbound connections.

 

Hardware/software details:

PBXnSIP v2.1.14.2498 (Win32) (Win XP Pro)

Sonicwall TZ170 - firmware SonicOS Enhanced 3.2.3.0-6e

Linksys SPA942 Phones - firmware version 5.2.2(a)

Linksys WRV 200 Routers - Firmware 1.0.39

VoIP provider is Callcentric

 

VoIP Layout Details:

The Sonicwall is the main router with the PBXnSIP hanging off of it. The Sonicwall is configured to pass all PBXnSIP ports to the PBX PC. There are 2 branch offices that connect via a VPN provided by the Linksys router to the sonicwall. Each office has a Linksys phone.

 

VoIP problem:

When no inbound calls are placed for an undetermined about of time, the first inbound call is either unanswered after a long silence or is answered by CallCentric’s voicemail. If a second inbound call is placed right away the PBXnSIP will pick up the call in a normal time. All incoming calls for the next undetermined amount time, are answered as normal.

Trouble Shooting details:

This problem appears to be corrected by enabling SIP Transformations under the VoIP section of the Sonicwall. However, when I enable this, both branch offices will lose audio both ways. The phones are still communicating with the PBX because missed call notifications are e-mailed when attempting to call one of the branch offices.

 

Any help you can provide will be greatly appreciated.

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I'm having a problem with getting reliable inbound connections.

 

Hardware/software details:

PBXnSIP v2.1.14.2498 (Win32) (Win XP Pro)

Sonicwall TZ170 - firmware SonicOS Enhanced 3.2.3.0-6e

Linksys SPA942 Phones - firmware version 5.2.2(a)

Linksys WRV 200 Routers - Firmware 1.0.39

VoIP provider is Callcentric

 

VoIP Layout Details:

The Sonicwall is the main router with the PBXnSIP hanging off of it. The Sonicwall is configured to pass all PBXnSIP ports to the PBX PC. There are 2 branch offices that connect via a VPN provided by the Linksys router to the sonicwall. Each office has a Linksys phone.

 

VoIP problem:

When no inbound calls are placed for an undetermined about of time, the first inbound call is either unanswered after a long silence or is answered by CallCentric's voicemail. If a second inbound call is placed right away the PBXnSIP will pick up the call in a normal time. All incoming calls for the next undetermined amount time, are answered as normal.

Trouble Shooting details:

This problem appears to be corrected by enabling SIP Transformations under the VoIP section of the Sonicwall. However, when I enable this, both branch offices will lose audio both ways. The phones are still communicating with the PBX because missed call notifications are e-mailed when attempting to call one of the branch offices.

 

Any help you can provide will be greatly appreciated.

 

http://wiki.pbxnsip.com/index.php/Troubles..._Trunk_Problems mentions a few search tips. Maybe it also makes sense to track the registration of extensions (send out an email when the status changes) to see if the registrations are stable.

 

SoHo-Routers can be a problem. Maybe if you have a problem next time try to reboot them to see if that makes any difference. We even had cases where the Ethernet switch gave is a problem and needed to be rebooted. "Divide and conquer" can help to isolate the problem.

 

Of course, if you are able to see where the INVITE from callcentric goes then you should be able to pinpoint the problem. Maybe it makes sense to run Wireshark at critical points. If you filter for port 5060 then the file size should be not outrageous.

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