Customers must certify that their local area data networking infrastructure meets or surpasses a set of guidelines prior to service installation. These include:
10/100 managed Ethernet switches capable of operating in full duplex mode. All ports used to service Q-Link VBX™ phones must be operating in full duplex at 100 Mbps.
QoS (Quality of Service) functionality on the LAN is required. Minimum required protocol is 802.1p (Layer 2 prioritization). Recommended protocol is DiffServ/TOS (Layer 3 service differentiation).
If the customer’s firewall performs stateful packet inspection (SPI) and understands the SCCP protocol, then SPI will need to be disabled for the SCCP (Skinny) protocol.
Some NAT implementations, such as Cisco's, also perform payload IP address translation for protocols they understand. Payload translation for SCCP needs to be disabled. On Cisco routers, the following command will disable this:
'no ip nat service skinny tcp port 2000'
Q-Link VBX™ uses UDP (User Datagram Protocol) requests to establish two-way communications with IP Phones on customer networks. Firewalls and NAT implementations may block this request and make this communication impossible. UDP session timers must be set to 180 seconds to assure this session may take place
Our phones and PCs running FrontDesk software must have clear and open access to UDP Port 69 for TFTP service
Cinergy
Communications is a wholly-owned subsidiary of Q-Comm Corporation. Although Cinergy Corp. has licensed the use of its name to Q-Comm, it has no management oversight, control or responsibility for Cinergy Communications.
