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Troubleshooting IP Solutions 2 H.323 Trunks
Administration for Network Connectivity
CID: 77730 555-233-504 — Issue 1 — April 2000
50
Troubleshooting IP Solutions
This section provides solutions to some commonly encountered problems with H.323 trunks and IP Softphones.
H.323 Trunk Problem Solving
Signaling group
assignments
Multiple H.323 trunk groups can be assigned to a single signaling group, as with
standard trunk groups that use circuit-switched paths. However, when multiple H.323
trunk groups have different attributes, it is usually better to assign each H.323 trunk
group to a separate signaling group. An H.323 signaling group directs all incoming
calls to a single trunk group, regardless of how many trunk groups are assigned to
that signaling group. This is specified in the field “Trunk Group for Channel
Selection” on the H.323 signaling group screen.
In the example shown in Figure 2, two trunk groups are assigned to the same
signaling group on each of two switches, A and B. Trunk groups A1 and B1 are set up
to route calls over a private network. Trunk groups A2 and B2 are set up to route calls
over the public network. The signaling group on switch B terminates all incoming
calls on trunk group B1 as specified by the “Trunk Group for Channel Selection”
field. Calls from switch A to switch B using trunk group A1 and the private NW are
terminated on trunk group B1, as desired. However, calls from switch A to switch B
using trunk group A2 and the public NW are also terminated on trunk group B1, not
trunk group B2, which would be the desired outcome.