SMG digital gateway
47
Q.931 LAPD—LAPD Channel-Level Parameters of Q.931 Protocol
Т200
—transmission timer. The timer defines the time period when a frame response should be
received, which enables transmission of next frames. The time period should be longer than the
time required to transmit a frame and receive its acknowledgement.
Т203
—the maximum time when the device may have no frames exchange with the opposite
device.
N200
—the number of frame transmission retries.
Q.931 Signalling Protocol parameters
TrunkGroup
—name of the trunk group this Е1 stream belongs to.
Scheduled routing profile
—the selected scheduled routing profile.
Access category
—the selected access category.
Dial plan
—defines the numbering schedule that will be used to route calls received from this port
(required for coordination of numbering schedules).
Numbering plan type
—defines the ISDN numbering schedule type. To use E.164 common
numbering schedule, select
ISDN/telephony
.
Calling category for incoming calls
—the caller ID category assigned to the calls received from this
port.
Send calling category
—enables transmission of the caller ID category as the first digit of the
number in the CgPN information element of the SETUP message.
Proper operation requires support of this mode
by the opposite party.
"End-of-dial" message
—issues the "
Sending Complete
" information element upon the "
End of
dial
" event (the event received from a linked channel; the maximum number of digits is achieved
according to the prefix; the dialling timeout for the next digit).
Do not send RESTART for interface
—when checked, the gateway does not send the RESTART
message into the line when a stream is restored (the channel level LAPD is established).
Do not send RESTART for channel
—when checked, the gateway does not send the RESTART
message into the line upon expiration of T308 timer. The timer activates when the RELEASE
message is sent into the channel and resets upon receipt of the RELEASE COMPLETE message in
response. If the RELEASE COMPLETE message is not received while T308 timer is active, the
RESTART message is transmitted to release the channel.
Channels selection order
—defines the order of physical channels provisioning for an outgoing call.
Four types are available: sequential forward, sequential back, from the first one and forward, from
the last one and back. To minimise the number of communication conflicts with adjacent PBXs,
inverse channel engagement types are recommended.
DialTone for incoming overlap-seize
—when checked, the gateway sends a
DialTone
into the line in
case of an incoming overlap engagement (the
"PBX response"
ready signal). In this case, an
overlap engagement
means that the SETUP message is received without "
sending complete
". To
switch between tracts, the SETUP message should have the progress indicator = 8.
Process PI 'In-band' in DISCONNECT
— when checked, field
PI In-Band
contained in
DISCONNECT
message will be processed for call clearback IVR voice message transmission otherwise this field is
ignored.