General IP Attributes

The following are general IP resource attributes that apply to voice and fax connections:

The VDAC-ONE card supports the IPv4 Type of Service field in the IP packet header. This field is used to instruct packet switches and routers in an IP-based network how to control packets sent from a
VDAC-ONE card. You can set options in this field to indicate that the packets should be given preferential treatment on a Class of Service basis.

Important! Most IP switches and routers do not currently support different levels of service.

You can configure the following IP Type of Service options for outgoing packets:

If the User Datagram Protocol (UDP) Source Port Validation is enabled, the VDAC-ONE card verifies that the UDP source port of the incoming packets matches the destination port of the originating outgoing packets.

You can create a timer for monitoring the first incoming network packet (RTP, RTCP, or T.38 packet) on a per channel basis.

When you enable this timer for a particular VDAC-ONE card channel, and if the configured timer value has elapsed and no packet is ever received, then this timer expires. A PPL Event Indication with Event ID 0x07 is generated.

The timer value is in 10 millisecond increments, 0x00 to 0xFFFF. By configuring the timer to a non-zero value, you automatically enable the timer.

To detect possible media inactivity occurrence, you can create a timer for monitoring the incoming RTCP packets at a per module or channel basis. When this timer is enabled for a particular VDAC channel, if the configured timer value has elapsed and no RTCP packets are received, then this timer will expire and generate a PPL Event Indication with Event ID of 0x08. This alerts the host on a possible media inactivity detection. RTCP must be supported by remote endpoints for this TLV to work.

The CNAME field is supported for the IPN-2 and VDAC-ONE cards. The CNAME field will automatically be populated at channel configuration time and included in the RTCP Sender Report. The CNAME field is not configurable.

The data used for the CNAME field is comprised solely of the ASCII character formats for the VDAC/IP module’s source IP address (15 bytes) and source UDP (RTP) port number (5 bytes) for a specific RTP voice session, separated by an ASCII "colon" (":") character (1 byte).

Internet Protocol. Part of the TCP/IP family of protocols used to route messages and tracks the addresses of nodes.

The point in the Excel platform where a DS0 connects to a network. Also known as a "socket."

Real-Time Transport Protocol. Supports transport of real-time data like interactive voice and video over packet-switched networks.

Tag-Length-Value block. A standardized block that allows data to inserted in a standard way into API messages.

UPD. User Datagram Protocol. Unreliable networking layer that sits at the same level of networking stack as TCP. Part of the TCP/IP protocol suit, UDP is used for transferring IP datagrams between host computers, where each datagram is routed through the Internet based on the destination IP address.

Real-Time Transport Control Protocol.

See Programmable Protocol Language.

A condition that, when met, drives a state machine from one state to another. A condition that drives a Component out of its current state by invoking an associated primitive.

American Standard Code for Information Interchange

The protocol used in most local area PC networks. Typically, most Ethernet networks support data transmission speeds up to 10 Mbps, but 100 Mbps is also possible.