THE NETWORK OFFERING CALL SERVER : PRIVATE NETWORKS
Ed. 0412/20 Réf. 3EH 21000 BSAA
There is no operator recall in the following cases of failure (the call is released):
- the trunk group is busy
- ISDN releases the call, the time-out for awaiting the 1st digit or interdigit having elapsed
TRANSIT
PABX B enables the transit of the following communications:
- from a user A to users of PABXs C and D
- from the public network to users of PABXs C and D
These communications are established by:
- public or private break-in -> private
- private break-out -> private or public
The transit system acts as an access between the different protocols used; the level of service offered
depends on the protocols implied in the communication:
- QSIG <-> ISVPN: services offered by QSIG
- ISVPN on public line <-> ISVPN on leased line: ISVPN services
- VPN (ISDN) <-> ISVPN or QSIG: ISDN services
PUBLIC
NETWORK
PABX A
PABX B
PABX C
T0
T0
PABX D
QSIG
LEASED Ligne
VPN
ISVPN
LEASED Ligne
OTHER
MANUFACTURER'S
PABX
ATL
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