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Chapter 28: PacketCable™ Services and Voice Applications

STANDARD Revision 1.0 C4® CMTS Release 8.3 User Guide

ACK timer: 8000 milliseconds

Maximum number of retransmissions to RKS: 0

Setting the Upstream DiffServ Code Point

When setting up a data network with voice, it is recommended that the entire network (access and backbone) be

configured to provide an enhanced QoS for telephony. One of the ways to do this is to use the DiffServ protocol. This

protocol uses a field in the IP header to determine the quality of service level to be used for each network hop. The C4/c

CMTS marks all upstream voice packets with the DiffServ code point that is provided by the CMS in the Gate-Set message.

This parameter should be provisionable on the CMS.

Event Messaging

PacketCable uses the notion of half-calls for its call model. Each half call consists of the portion of a call from the C4/c

CMTS to the other device – either an MTA or a PSTN gateway. These half-calls are signaled independently of one another

and are tied together only by the logical connection that the CMS creates when it sets up each half call. These half-calls are

also signaled separately for billing purposes. Billing events for each half call are transmitted to a Record Keeping Server

(RKS). The RKS then correlates all events for the full call and creates billing records. The protocol used by devices that

communicate to the RKS is known as Event Messaging.

Event Messaging port number — The C4/c CMTS uses the static port 1813 for Event Messages. The C4/c CMTS listens to

port 1813 when PacketCable services are enabled, and uses port 1813 as the source port in the UDP header of any Event

Messages.

Event Messaging Retry Interval — The Event Messaging Retry Interval is the maximum amount of time that the C4/c CMTS

waits for an acknowledgment of an event message before the C4/c CMTS assumes that the message is lost. At this point,

theC4/c CMTS either retransmits the message or switches to the secondary RKS. To set the Event Messaging Retry Interval,

issue the CLI command:

configure packetcable eventmsg retry timer <time>

The default value of this timer is 1000 milliseconds. This timer has a range of 10 to 10,000 milliseconds.

Event Messaging Retry Count — The Event Messaging Retry Count is the maximum number of times that the Event

Messaging Retry Interval may expire before the C4/c CMTS switches to the secondary RKS. To set the Event Messaging

Retry Count, issue the CLI command:

configure packetcable eventmsg retry limit <count>

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