OTE PUMA T2 - Telephone Interconnect Call

PUMA T2
Technical Handbook
General information
Page 12 OTE Proprietary information
P/N: 779-0306/01
Revision 03
To change the current talk group, the radio unit user is required to detach from the
current group and re-attach to the new one. The procedure is performed on air,
according to pre-defined TETRA attachment /detachment procedures.
On the mobile terminal, the group addresses are assigned to a group selector
which is mapped to a related Working Profile Subset (WPS). Up to six WPS,
selectable by the radio unit user, are programmed in the mobile terminal thus
providing a maximum of 96 available group addresses.
1.4.4 Telephone Interconnect Call
Telephone interconnect calls enable the users of the customer’s telephone network
to connect to TETRA users and Talk Groups.
Individual calls can be full or half-duplex according to the capability of the TETRA
users equipment.
Talk groups connections are always half-duplex. PABX user can be part of the talk
group only as a calling party, i.e., by dialling into the talk group through the PABX
interface.
During a half-duplex interconnect call, the PTT request from the PABX user is
managed by the SCN PABX interface using voice activity detection.
For an incoming call from the PABX gateway to the TETRA System, the connected
SCN can accept either direct or over dialling (see note) during the call set-up.
Note
With over-dialling the PABX user dials the PABX gateway address, whereupon a voice announcement
invites the user to dial the required mobile user address.
Regardless of where the user is located in the network, the system infrastructure
will be able to call dialled user.
When a TETRA user (individual or group) is called by a PABX user, the complete
TETRA seven-digit address identifier must be dialled.
DC operator intervention is required to call the radio unit or talk group not having
the rights to receive automatic telephone interconnect calls.
Outgoing calls from the system to the PABX, require the privileged radio unit user
to select the telephone interconnect call mode (e.g. by a functional key), and dial
the telephone number.