Specifications

Engineering Guidelines
142
Figure 19: Signalling and Voice Path Example 1
In the tandem case, a virtual IP trunk is used from A to B and another virtual IP trunk is used
from B to C. These trunks are counted against the routing limit.
In certain networks, especially external WANs that use VPNs, the most direct path from A to C
may actually be through the IP router at site B. However, the 3300 ICP at this site only handles
the signalling and not the voice traffic.
Figure 20: Signalling and Voice Path Example 2
Consider the different routing in different parts of the network when bandwidth calculations are
involved. Refer to “Traffic and Bandwidth Calculations” on page 220 for bandwidth calculations.