Hello everyone I am currently employed as tech support and where I work I encounter this "weird" issue (hopefully there is a specific reason for this), basically its a VOIP Phone that connects trough a VPN tunnel using the internet from lets call it, Office-B to Office-A to the PBX server stored locally.
*I will provide a diagram to make it as clear as possible.
So I have this IP Phone connected to a 24 hub / really old 10/100 unmanaged switch inside an external warehouse, this switch is connected via Point-to-Point wireless antennas to a switch in the main office to get internet / LAN access; then it goes to the sonic wall appliance and that is connected the ISPs routers in this case AT&T, from there it goes to the VPN tunnel using the internet, in the other end of the tunnel there is a very similar structure but the phone its supposed to reach to the PBX on OFFICE-A which it does but it can only receive calls but it wont make calls, it kinda looks like it goes trough it rings once and choppy and then it says network disconnected.
Network Diagram
The VOIP phone I am using is a SNOM 300 and I tried to connect the same phone on OFFICE-B directly to the Switch and it will do the same I mentioned above, then I tried to setup the phone on OFFICE-A and it would work just fine, it doesn't matter whether or not its using 10.10.1.x or 172.20.20.x, the phone would work on OFFICE-A just fine.
Could you help me troubleshooting this issue or where can I start looking up?
Please also let me know if you need more information to begin with or tell me where should I post this so it gets more exposure since I really dont know if its right to put it here in the networking tab.
I intended to use wireshark in order to see at what point the packet stops or something similar, but I dont know how to set that up like what cables goes where, it might be an issue considering how much equipment its being used here.
*I will provide a diagram to make it as clear as possible.
So I have this IP Phone connected to a 24 hub / really old 10/100 unmanaged switch inside an external warehouse, this switch is connected via Point-to-Point wireless antennas to a switch in the main office to get internet / LAN access; then it goes to the sonic wall appliance and that is connected the ISPs routers in this case AT&T, from there it goes to the VPN tunnel using the internet, in the other end of the tunnel there is a very similar structure but the phone its supposed to reach to the PBX on OFFICE-A which it does but it can only receive calls but it wont make calls, it kinda looks like it goes trough it rings once and choppy and then it says network disconnected.
Network Diagram
The VOIP phone I am using is a SNOM 300 and I tried to connect the same phone on OFFICE-B directly to the Switch and it will do the same I mentioned above, then I tried to setup the phone on OFFICE-A and it would work just fine, it doesn't matter whether or not its using 10.10.1.x or 172.20.20.x, the phone would work on OFFICE-A just fine.
Could you help me troubleshooting this issue or where can I start looking up?
Please also let me know if you need more information to begin with or tell me where should I post this so it gets more exposure since I really dont know if its right to put it here in the networking tab.
I intended to use wireshark in order to see at what point the packet stops or something similar, but I dont know how to set that up like what cables goes where, it might be an issue considering how much equipment its being used here.
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