TD 92685EN
28 June 2012 / Ver. A
Troubleshooting Guide
Ascom i62 VoWiFi Handset
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3. The VoWiFi Handset as
now forward the INVITE to user2. The start of the process is shown in figure 6:
Figure 6. Call Invite
Before the INVITE message reaches the phone of user2, the SIP proxy serverB uses its
registration server and location database to find the IP address of user2. ServerB performs a
SIP service lookup on the database to find a match for the AOR that it has received from SIP
proxy servera.com, as shown in figure 7:
Figure 7. Far End Lookup
The result of the lookup is an IP address (172.20.15.235) that serverB can now bind the
INVITE message to. Once the association is established, the INVITE message reaches user2,
as shown below:
Figure 8. Number Binding
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