ITS IP Voice Services

Network Requirements

The following requirements and guidelines need to be considered when adding or transferring to an IP voice service.

For IP Phones

Unit Phone Administrator

The person responsible for purchasing phone service for the unit should consider:

Unit Network Administrator

Cisco or Juniper Switch It is recommended that the closet switch (to which an IP phone will connect) support IEE Power Over Ethernet standard 802.3(af or at) This standard means the phones do not need to be locally powered. Phones are also protected from losing power since closet switches have UPS installed.
Ethernet Port It is not necessary to have a separate data line configured to connect an IP phone to the network if there is an office computer that is already connected to the network. The office computer and IP phone can share the data line. With this shared arrangement, select an IP phone that has two Ethernet ports with 10/100/1000 Mb/s speeds.
In some situations, a separate data line needs to be allocated for an IP phone. A phone that has only one Ethernet port with a 10/100 Mb/s speed is adequate for this service.
Network An IP phone is connected to an ITS controlled VLAN. The phone will acquire its configuration from the ITS DHCP server. QOS parameter will be enabled on network components to support IP voice traffic.
Unit Firewalls ITS VLAN voice traffic will not pass through unit firewalls. No configuration change is needed on unit firewalls for hardwired IP phones.
Service Protocols and Ports TCP: 2000 (Skinny Call Control)
UDP: 69 (TFTP config download)
UDP:67 (DHCP Client Config)
UDP: 16384 to 32767 (RTP Voice)
TCP/UDP: 80 (http Service)
No configuration change is needed on unit firewalls for hardwired IP phones.
Client Access (
TCP: 443 and 8443
Unit firewalls are required to allow access to ITS Voice Server.

For IP Contact Centers

See IP Contact Center Technical Specifications for workstation and network firewall configuration information.

For Special IP Services

If you need to interface with specialized equipment (for example an integrated phone in an audio system), ITS will support devices that utilize SIP signaling protocol. However, due to limitations on certain feature interoperability, ITS IP Operations needs to be consulted about the purpose and type of device that requires support.