Expert Documentation

Chapter 6
Each DSP placed in the "VoIP access" pool is considered as a "network access" by the PBX, i.e. 1 VoIP
DSP = 1 B-channel. The PowerCPU board can be equipped with an ARMADA VoIP32 daughter board
providing up to 32 additional VoIP resources. The maximum number of VoIP resources is therefore 48
i.e. 48 "IP" B-channels.
Network accesses (T0, T2, analog TL, DLT0, DLT2) + VoIP Accesses = 120 Max.
6.3.4.1.2 Configuring the gatekeeper (optional)
By OMC (Expert View): System -> Voice on IP -> VoIP: Parameters -> Gatekeeper tab
- Integrated gatekeeper: By default, the Gatekeeper is integrated into the PBX (box is
selected); if not, fill in the Gatekeeper's identification
- IP Address: If the PBX is a gateway in an H.323 area, one must use an external
gatekeeper that is the manager of the H.323 area it covers, indicating its IP Address
provided by the network administrator
6.3.4.1.3 Configuring the Gateway timeouts (optional)
By OMC (Expert View): System -> Voice on IP -> VoIP: Parameters -> Gateway tab
NB: The parameters have standardized values, do not change them without prior analysis.
- RAS Request Timeout: Maximum authorized response time for a RAS request
("Registration, Admission, Status") made to the gatekeeper; between 10 and 180; default
value = 20
- Gateway Presence Timeout : Determines the presence of a remote Gateway; value
between 10 and 600; default value = 50
- Connect Timeout: Maximum authorized time interval between initialization and
connection; value between 10 and 1200; default value = 500
- H.245 Request Timeout: Maximum authorized response time for an H.245 request; value
between 10 and 60; default value = 40
- H323: End of dialing timeout: Default value = 5
6.3.4.1.4 Configuration of T38 parameters for Fax over IP (optional)
By OMC (Expert View): System -> Voice on IP -> VoIP: Parameters -> Fax tab
- UDP Redundancy: Number of forwardings of Fax data packets; value between 0 and 2;
default value = 1
- Framing: Number of frames in the same data packet ; value between 0 and 5; default
value = 0. In fact, the number of frames is equal to the number in this field + 1
Note:
a) Only T38 traffic is supported: modem, V90, V24, etc., are not available via H323/SIP connection. b) If
the UDP redundancy is set to 0, any framing value (0 to 5) can be used. If the UDP redundancy is set to
1, the framing value must not be higher than 1.
6.3.5 Configuring a Remote H.323 Gateway
6-14