Cisco WS-X4604-GWY - VoIP Gateway Especificaciones descargar pdf (Pagina 157)

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Cisco IP Telephony Network Design Guide

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Chapter 6 Multisite WAN with Distributed Call Processing

Dial Plan Considerations

Gatekeeper Configuration

The gatekeeper configuration requires you to enter the zones, each

Cisco CallManager that will register with that zone, the zone prefix (directory

number ranges), bandwidth allowed for call admission, and the technology prefix

for voice.

Because Cisco CallManager does not indicate the gatekeeper zone with which it

wishes to register, you must explicitly specify the IP address of the

Cisco CallManager in a single zone and then disable registration of all other

IP address ranges. For example

zone subnet LHR 172.26.18.2/32 enable

zone subnet LHR 172.26.18.3/32 enable

no zone subnet LHR 0.0.0.0/0 enable

Cisco CallManager registers with the gatekeeper using its IP address as the H.323

ID.

To specify the directory number range for a Cisco CallManager cluster, you must

statically configure it on the gatekeeper because currently this information cannot

be added during registration. For example

! LHR CallManager cluster has DN’s in the range 3000 3999

zone prefix LHR 3...

The maximum number of calls that can be placed into and out of a zone depends

on the codec used for each call. In Cisco CallManager Release 3.0(5), G.711 and

G.729 request 128 kbps and 20 kbps, respectively. This mechanism allows

enforcement of call admission control, which maintains QoS. For example

zone bw LHR 512

Finally, you must specify the technology prefix used for the Cisco CallManagers.

Within the gatekeeper, you must also specify this as the default technology for any

E.164 addresses that do not have a technology prefix. There is no need to specify

each Cisco CallManager statically because the cluster registers the technology

prefix and the fact that it is a VoIP gateway. For example

gw-type-prefix 1#* default-technology

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Cisco WS-X4604-GWY - VoIP Gateway Especificaciones Pagina 157