Calculation Example 5: Virtual Private Network Vpn - Siemens HiPath 3000 Service Manual

wclient.fm
Workpoint Clients
IP Telephony (Voice over IP)
10.6.4.4.5

Calculation Example 5: Virtual Private Network VPN

Two branch systems (HiPath 3550 or HiPath 3500) should be connected to a central system
(HiPath 3750 or HiPath 3700) via VPN. The central system only has TDM workpoint clients.
Eight IP networking channels are available via LAN interface 2 for the connection to the branch-
es. Both branches have 30 IP workpoint clients and eight gateway channels for the connection
to the ISDN trunk. Additionally, four IP networking channels are available for connection to the
central office.
G.711 with a sample rate of 20 msec is used for the VPN networking. The connection between
the central and branch offices should be set up over the Internet using an AES-encrypted VPN
tunnel.
The following boards are necessary for this configuration:
Central office: An HXGM3 (2 DSPs per HXGM3 together supporting up to 16 channels)
●
Branch office: One HXGR3 each (1 DSP per HXGR3, supporting up to 8 channels)
●
Correspondingly, the total performance available in the central office is 980 points, and 780
points in each of the branches.
Central office requirements
Eight gateway channels via LAN interface 2 with AES encryption should be included in the cal-
culation. Since VPN functionality is required, the WBM setting "Enhanced B Channels" is de-
activated.
Signaling without
H.235 security (inde-
pendent of the WBM
setting "Enhanced B
Channels")
Payload (additional
feature: "Enhanced B
Channels" disabled
over WBM.)
The specified performance requirement of 737.6 points is below the 980 total performance
points that the HXGM3 board can provide. This configuration is feasible for the central office.
10-80
Function
8 x IP networking channel (25 calls per hour)
Voice gateway channel over LAN interface 2 with encryption:
8 x G.711 (received: 20 msec/sent: 20 msec)
with AES encryption
Total =
P31003-H3550-S403-4-7620, 02/05
HiPath 3000 V5.0, HiPath 5000 V5.0, Service Manual
Resource require-
ment
(credit point)
8 x 3.2 = 25.6
8 x 89.0 = 712.0
737.6