Nortel Networks NN43001-563 IP Trunk 3.01 (and later) and CS 1000S/CS 1000M

IP Trunk3.01 (and later) and CS 1000S/CS 1000M 25

CS 1000M do not require a Gatekeeper Request from IP Trunk 3.01

(and later); therefore, no Request or Conﬁrm is sent.

2. Gatekeeper Conﬁrm (GCF) – From the Gatekeeper to the Active

Leader,with the functional Gatekeeper IP address. This address is used

for all call control messaging and registration messages between the IP

Trunk3.01 (and later) cards and the Gatekeeper.

3. Gatekeeper Registration Request (RRQ) – From the Active Leader to

the Gatekeeper, with all of the node’s IP addresses.

IP addresses are only sent if required. A CS 1000M does not require all

IP addresses, so the IP addresses are not sent.

4. Gatekeeper Register Conﬁrm (RCF) – From the Gatekeeper to the

Active Leader, providing the TTL prior to a re-registration attempt by

the leader and indicating under what conditions admission requests

are needed.

Typically,the TTL is in minutes. The default IP Trunk3.01 (and later)

value, if no response from the Gatekeeper is received,is 300 seconds.

However,the Gatekeeper can enforce a shorter inter valin seconds or

tens of seconds. The standards allow seconds from 1 to (232) –1.

Recommendation

Nortel recommends that the TTL be provisioned in the 30- to 60-second

range.

The IP Trunk 3.01 (and later) node must perform a "keep-alive"

re-registration prior to the expiry of the timer on the Gatekeeper. When

the Gatekeeper timer expires, a full registration is needed.

IP Trunk 3.01 (and later) and CS 1000S/CS 1000M

The CS 1000M systems use virtual trunking (IP Peer Networking) to

inter-operate with the IP Trunk 3.01 (and later) nodes. However, the CS

1000M can be a Gatekeeper for the system.

When IP Trunk3.01 (and later) is part of a network with a Signaling Ser ver

acting as a central control point, it is able to take partial advantage of a

feature known as IP Peer Networking. IP Peer Networking eliminates the

multiple conversions between IP and non-IP circuits, increasing call routing

efﬁciency and overall voice quality. Many calls involving an IP Peerendpoint

and one or more IP Trunkendpoints can use this capability. However,calls

that use only IP Trunkfacilities, and a small subset of calls involving both

IP Trunkand IP Peer, cannot obtain this beneﬁt.

IP Trunk3.01 (and later) suppor ts Gatekeeper Registrationand Admission

Signaling (RAS) and Call Admission Signaling. IP Trunk 3.01 (and later)

interworks with CS 1000M, which fulﬁlls the role of a Gatekeeper. Using

Nortel Communication Server 1000

IP TrunkFundamentals

NN43001-563 02.01 Standard

Release 5.5 21 December 2007