Chapter 16 Wireless System
UNIVERGE NEAX 2000 IPS Request For Proposal (RFP) Reference Guide Page 16-5
Issue 6
Q. 931a Roaming over IP Trunk
Dterm PS III user can originate or receive a call in any place of a network provided by the plural PBXs,
which are interfaced by JT-Q931-a protocol over IP Trunks. Q931a Roaming over IP Trunk is
available only on the Point-to-Multipoint connection. Roaming by Q931a digital private line and
Roaming by IP network cannot be used together in one PBX. A Roaming IP network consists of
maximum 255 PBXs. Roaming via Virtual IPT and Roaming via Physical IPT cannot be used together
in one PBX. IP-PAD card is required for the Roaming via Virtual IPT, when the called/calling station is
the legacy terminal (Dterm/Single Line telephone/ATTCON, etc.).
Configuration Application: Integrated Type and Adjunct Type with CCIS interface
Service Conditions
1. A roaming service network can be provided by maximum 512 PBXs.
2. One AP00 card for Data Base Module (DBM) is required per PBX.
3. An AP00B DBM-C is required when accommodating 257 or more PS’s per site.
4. Both Multi-Site Roaming (using DTI) and this feature cannot be provided in the same system. i.e.
the roaming network must be configured in only DTI trunks or IP trunks.
5. Visitor Location Register (VLR) information for maximum 512 Visitor PSs can be recorded to a
system. When the VLR information exceeds for more than 512 Visitor PSs, AP00 deletes the
oldest VLR information in the system.
6. When a call terminates to a Multiline Terminal from a PS, the ringing of the Multiline Terminal is as
follows, regardless of Home PS or Visitor PS:
When the PS is under control of the same PBX: Ringing for Internal call
When the PS is under control of the other PBX: Ringing for External call
7. When the Home PS is roaming, the Home PBX cannot route Announcement-PS No Answer /-PS
Out of Zone to the calling party. If the Visitor PBX allowed it will inform the Home PBX that the PS
cannot answer, the Home PBX activates Call Forwarding-Not Available.
8. Billing of Home PS is executed to its Virtual LC Number.
9. While the Home PS is roaming, billing information cannot be recorded.
10. The Visitor PS can allow following service features.
Originating a call to a station of the same office
Originating a call to a station of the different office
Terminating a call from a roaming trunk
PS Exclusive Hold
Call Forwarding
11. The visitor PS cannot allow Calling Name Display.
12. Maximum 64 Visitor PSs can originate or receive a call in a network at the same time.
13. The Visitor PS can answer a call only from the roaming trunk.
14. Billing of Visitor PS is executed to its Virtual LC Number.
15. Billing information for the Visitor PS can be recorded only when the Visitor PS originates a call.