NEC 8100 SIP server won't communicate through router/switch

cgillet
cgillet used Ask the Experts™
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Moving offices this week. Telco guys setup VoIP server on Monday with 2 POTS phones and 2 VoIP phones. To test ip phones I plug in the 2 phones, 1 pc and sip server into linksys befsr41 built in 4-port switch. Basic configuration of DHCP pool, Default Gateway, DNS, Internal IP, External IP. FULL CONNECTIVITY. Calls going out. Calls coming in. Pings to phones and voip server successful.

I need to add a switch to connect the remainder of the office. Insert 16-port Gigabit Dlink switch. Plug in everything to the switch, 1 patch cable to the linksys router. Full connectivity between pc's, Internet access, pings to the ip phones. NO PINGS TO THE VOIP SERVER.

I leave everthing else plugged into the switch and plug the voip server into the linksys. Full connectivity to the voip server. At this point the only way to communicate with the voip server on the LAN is specifically through the linksys befsr41 built in switch.

I replace the Linksys befsr41 with a Linksys wrvs4400n. I setup the same basic configuration as on the befsr41....DHCP pool the same, Default Gateway, internal IP, external IP, DNS server...all the same. Plug in WAN, plug in voip server, plug in patch cable to switch.....NO CONNECTIVITY TO VOIP SERVER. I can ping the phones, browse the web, share files between pc's, but no pings or sip info from the voip server.

I replace the linksys wrvs4400n with a dlink DIR-825. I setup the same basic configuration as on the befsr41....DHCP pool the same, Default Gateway, internal IP, external IP, DNS server...all the same. Plug in WAN, plug in voip server, plug in patch cable to switch.....NO CONNECTIVITY TO VOIP SERVER. I can ping the phones, browse the web, share files between pc's, but no pings or sip info from the voip server.

My only possible thought is that the NIC in the NEC 8100 VoIP server doesn't  like connecting to devices that are 10/100/1000. The linksys befsr41 is the only device that will connect me to my voip server and it's also the only device that is 10/100.

Any Ideas?

1 x NEC 8100 VoIP server
1 x dlink 10/100/1000 16-port unmanaged switch
1 x linksys befsr41 Cable/DSL router w/ 4-port switch
2 x NEC IP phones
5 x pc's via ethernet
tried
1 x linksys wrvs4400n
1 x dlink dir-825

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Commented:
so if you can't ping voip server only, then you really should check it's connection settings.
speed 10/100/1000, duplex, ip address, etc.
please provide that info from NEC.

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