Alcatel-Lucent Intelligent Services Access Manager - Manual (Page 9)

Alcate-Lucent ISAM Voice 9
Key ISAM voice features
Signaling protocols
Alcatel-Lucent ISAM Voice implements H.248/Megaco
and SIP signaling to connect to NGN/IMS networks.
ISaM call control and traffic
dimensioning with H.248/Megaco
Alcatel-Lucent ISAM Voice incorporates a separate
call control engine that can be centralized for as many
as 5,000 subscribers distributed in a number of access
nodes (using either the Alcatel-Lucent 7302 ISAM, the
7330 ISAM FTTN Remote Aggregator or the 7356 ISAM
FTTB Remote Expansion Module). The signaling gate-
way, or NVPS, is not overloaded with payload processing
as this is done in the line card itself. The NVPS handles
signaling events only, and supports up to 10 call attempts
per second.
emergency calls with H.248/Megaco
Ten percent of the call capacity is always reserved for
emergency use, in addition to the 512 active, regular calls
handled by the NVPS with H.248. Because each line card
has its own user agent, ISAM can always initiate an emer-
gency call.
Voice traffic prioritization
The line card packetizes voice traffic into IP packets with
the highest IP priority. These packets are delivered to the
highest priority virtual local access network (VLAN) queue
of the Alcatel-Lucent ISAM. For voice traffic, the strict
priority queue assures minimum delay.