Dear All ,
I have this Case , There is a customer has HQ and Branches in the HQ there is SV8100 in HQ and they want connect remote IP phones in the Branches
The Topology of network I will describe between HQ and one branch because this topology applied the same with all branches
There is Router behind PABX and there is Router behind IP phones
The connectivity between them SHDSL and there is static Router applied in two router to make the two location as one network
my Problem the IP phone can't connect with PABX " SIP Server Not Found " although i am already upload NAPT license on the PABX but without port forwarding in two routers because they unconvinced they need to do port forwarding because they are one network and they are many applications working on this environment without need to port forwarding and the IP phone was working suddenly stop after this i suggested we need to NAT
Any one can help me in this issue
If you aren't on a VPN, or same network you HAVE to do port forwarding. The white paper is on the NTAC site and is very plain about this.
There is no NAT need because they are as one network
I will explain the Topology , this ministry has their routing and there are routers for PALTEL in the way to make the HQ and branch speech together , the HQ and branch speech together from LAN IP router like 10.111.73.X can talk with 10.110.74.X without need to WAN port in the router the WAN port to make Ministry router talk with PALTEL Router which are in the WAY this interface has IP 172.23.21.X
there is static routing in the PALTEL routers and Ministry routers
Then you are blocking ports. Put the phone one the local network to see if it comes up. If it does you have network routing issues.
Very Simple:
If IP phones working then "suddenly stop" is true:
Then someone changed something. What changed?
The IP phone locally is working direct without any problem
How is routing issue if the HQ network and Branch connected together and there is ping and there are many application working through this network
I don't know what is the problem
You have ports blocked somewhere. Namely 5080-5081 if the phones aren't coming up. Talk paths are different. This is assuming you have the phone IP address correctly in the phone.
what do you think about SIP ALG it should disable or enable on the router ?
Why the IPLA on the local network is pinging without any problem but from branch doesn't
Is there any programming in SV8100 enable this ??
Hold down the Help Key on the IP Phone and then select the Ping on the screen of the phone. try and Ping from the Phone to the IPLA Address. If you can ping than the port 5080 and 5081 is blocked. If you cant ping than it is a routing problem
Hold down the Help Key on the IP Phone and then select the Ping on the screen of the phone. try and Ping from the Phone to the IPLA Address. If you can ping than the port 5080 and 5081 is blocked. If you cant ping than it is a routing problem
I am asking why i can't ping the IPLA card forget it the ports , I mean i can't ping the IPLA card from PC not only IP phone any PC in branch side can;t ping the IPLA IP it is not ports and routing issue
Mohammad,
Is the Gateway in the phone system correct?
Just to clarify.
The phone system is at 10.111.73.X
From that network you CAN ping the phone system?
From any other networks, you CAN NOT ping the phone system.
Routes check out fine. You can ping from any device on the network to any other device on the network regardless of the subnet? Only the phone system does not respond to ping s from outside of its local LAN?
I would triple check the subnet mask and the gateway settings on the phone system
yes , what you said is correct everything is pining from branches except the phone system doesn't response the ping so that the phone can't register to phone system
The Subnet and gateway are correct on the remote phone i did double check
But on the phone system is the Gateway correct?
From your description, I can't figure out what's happening either. There shouldn't be an issue if all the pings to other devices work but not phone system.
I know some routers could be set up not to respond to ping, but I don't think there is a configuration to turn off ping response on the phone system.
one way is to replace the phone system with your computer with the exactly same IP, try to ping from and to it. If it works well, maybe it's a phone system issue, otherwise I think it's a routing issue.
Another is to use TRACERT command to trace the path from branch to phone system.
GOOD LUCK!
I have one strange question
Why the remote IP phone work once we install it after that it became give SIP SERVER NOT FOUND ... What Happened ???
I need to logical analysis , because the customer not convinced it is network issue
You say "this ministry has their routing and there are routers for PALTEL in the way to make the HQ and branch speech together , the HQ and branch speech together from LAN IP router like 10.111.73.X can talk with 10.110.74.X without need to WAN port in the router the WAN port to make Ministry router talk with PALTEL Router which are in the WAY this interface has IP 172.23.21.X"
I don't think everyone is quit following the description of this customers network. But it sounds like it's an "MPLS" type setup where the carrier provides a router for the customer. The customer has routers as well that are being used behind the carriers routers.
Hopefully, the carriers routers pass all packets through to let the customer route the packets. If not, it'll be tough because the issue could be on either the carriers router or the customers router.
Static routes should be built in the customers router to allow the necessary range of ports through to the phone system.
Bottom line is this - if you can ping the VoIP IP while on the same LAN as the phone system, but cannot ping when outside of that LAN, there are ports blocked.
I don't think they will believe that.
He keeps saying no ports blocked but have they looked?
Wireshark it.
what is the best test i should do to make customer convince there is problem in their network ?
I agree with 'brokeda'. Run Wireshark Traces. Have them mirror the port the PBX is plugged in to with a port your laptop is plugged into. Then use the "ip.addr==xxx.xxx.xxx.xxx" filter to look for the IP Address of the remote phone.