Lucent Technologies Release 8.2 manual Codec Bandwidth Requirement, UDP Port Range Min Max

H.323 Trunk Administration 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:

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

•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.

Administration for Network Connectivity
555-233-504 — Issue 1 — April 2000	CID: 77730	35