
176 Interoperability
P0609327 02
Business Communications Manager IP Telephony interoperates with the Gatekeeper applications
*Radvision ECS 3.2, CSE 1000, and NetCentrex, which conform to the specifications in the
following tables.
* Meridian 1-IPT does not support the Radvision gatekeeper.
Speech path setup methods
Business Communications Manager version 3.5 and newer software initiate calls using H.323
fastStart methods. The Business Communications Manager will accept and set up calls that have
been initiated by another endpoint using H.323v2 fastStart methods, as well as H.323 slowStart
methods.
Table 43 Engineering specifications
Capacity 1 to 8 ports
Voice compression G.723.1 MP-MLQ, 6.3 kbit/s or ACELP, 5.3 kbit/s
G.729 CS-ACELP, 8 kbit/s
(supports plain, Annex A and Annex B)
G.711 PCM, 64 kbit/s u/A-law
Silence compression G.723.1 Annex A
G.729 Annex B
Echo cancellation 48 ms tail delay
In-band signaling DTMF (TIA 464B)
Call progress
Speech path setup methods Call Initiator:
• H.323 fastStart
Call Terminator:
• H.323 slowStart
• H.323v2 fastStart
End-to-end DTMF signaling digits 0-9, # and *, fixed-duration tones only
Table 44 Supported voice payload sizes
Codec Receive/transmit to M1-IPT Receive/transmit to others
G.711 Highest supported by both ends, up to
30 ms in 10 ms increments.
30 ms
G.723.1 30 ms 30 ms
G.729 Highest supported by both ends, up to
30 ms in 10 ms increments.
30 ms
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