DIMENSIONING - LIMITS CALL SERVER : VOICE ON IP
Ed. 044/8 Réf. 3EH 21000 BSAA
The mean number A must be reduced by the number of network accesses one wants to have in this
system. A new value, called B, is calculated from the following formula:
B = Total number of network accesses - int.(B1/10) + int.(B2/20)
- B1 represents the total number of non-IP subscribers in the system (the number of IP Enablers in
the system is not included)
- B2 represents the total number of IP Enablers in the system.
- Int(B1/10) represents the whole number resulting from dividing B1 by 10 and int(B2/20) the whole
number resulting from dividing B2 by 20.
From the values A and B one obtains:
Mean number of DSP channels required for VoIP services = Min(A, absolute value of B)
Where Min(A, B) means: the smaller of the two values A and B.
Nota : The total number of DSP channels to be implemented for IP Telephony and/or IP network
accesses will be increased
to the next higher value out of the possible combinations of DSPs
present in the system (reminder: a VoIP daughter board supports 4, 8 or 16 DSPs; the sys-
tem contains from 2 to 96 DSPs, varying every 2, except for 92).
In the case of IP telephony and IP trunk mixing, simply total the DSPs.
Number of
IP Enablers
150 155 160 165 170 175 180 185 190 195
Number of DSPs
(A)
55 57 58 60 61 63 64 66 67 69
Number of
IP Enablers
200
Number of DSPs
(A)
70
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