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H.323 Trunk Administration
35
Administration for Network Connectivity
555-233-504 — Issue 1 — April 2000 CID: 77730
2 H.323 Trunks
You can also use the Audio IP port number range field to specify a block of port
numbers to be used for audio connections. Then, if your network is equipped with the
appropriate data filtering devices, audio data can be segregated from other data traffic
to improve quality of service.
Open the screen with the change command (ch ip-p) and set the following fields:
• Codec type = {enter as many of the following types as supported by this switch, in
the preferred order of usage — G711A, G711Mu, G723-6.3k, G723-5.3k,
G.729A}. Refer to the following table of bandwidth requirements to decide which
codecs to administer:
• Audio IP port number range =
UDP Port Range
Min: 2048
Max: 65535
The G711 codecs use either an A-law or Mu-law companding algorithm. The Mu-law
algorithm is used in the U.S. and Japan; the A-law is typically used in other countries.
Best Service Routing The call center Best Service Routing (BSR) feature can be implemented using H.323
trunks. You can use H.323 trunks for just the polling function or for both the polling
and interflow functions. Since polling requires only a small amount of data exchange,
the additional network traffic is insignificant. However, the interflow function
requires a significant amount of bandwidth to carry the voice data. Depending on the
other uses of the LAN/WAN and its overall utilization rate, the voice quality could be
degraded to unacceptable levels.
Lucent recommends that if H.323 trunks are used for BSR interflow, this traffic
should be routed to a low-occupancy or unshared LAN/WAN segment. Alternatively,
you might want to route internal interflow traffic (which may have lower
quality-of-service requirements) over H.323 trunks and route customer interflow
traffic over circuit-switched tie trunks.
Codec Bandwidth Requirement
G711 A-law @ 64Kbps 117.6 Kbps
G711 Mu-law @ 64Kbps 117.6 Kbps
G723 @ 6.3Kbps 31.1 Kbps
G723 @ 5.3Kbps 29.6 Kbps
G729A @ 8Kbps 33.6 Kbps