Example:
No. of SIP Trunk (G.711): 2
No. of Remote SIP Extension (G.729): 2
No. of Remote SIP Extension (G711, and Remote Video): 1
In this case, the required bandwidth will be as follows:
Required Bandwidth = 87.2 × 2 + 31.2 × 2 + (87.2 + 512) × 1 = 836 kbps
Bandwidth Limitation
Packets used for voice and video calls have priority over other packets.
Packet Priority
SIP High
RTP/ RTCP (For audio and video) High
Others (HTTP, SMTP, etc.) Low
If the bandwidth for high priority packets (SIP/ RTP/ RTCP) cannot be sufficiently ensured, bandwidth for
lower priority packets (Others) can be limited. You can limit the maximum bandwidth of low priority packets
(Default: 500 kbps) via the Web Maintenance Console.
Refer to 3.2.1 Network Configuration—[3-1] WAN—WAN Setting—WAN－Option－Bandwidth Limitation for
Others in the Programming Item List.
Maximum bandwidth can be calculated using required bandwidth as below:
Maximum bandwidth = Effective Bandwidth
1
－Required Bandwidth
*1
Effective bandwidth: the smaller of upload and download bandwidth
Example:
Effective Bandwidth (WAN1): 2,000 Kbps
Required Bandwidth: 836 kbps
⇒ Maximum bandwidth = 2,000－836 = 1,164 (kbps)
In order to increase speech quality, the packet (Others) bandwidth should be limited to 1,164 kbps or less.
3.4.3 Bandwidth Requirements
70 Getting Started
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