Panasonic KX-NS1000 Installation Manual page 241

Codec
G.711/G.722
G.729A
G.722 is only available for calls between KX-NT300 series IP-PTs and some SIP phones that support this codec during peer-to-peer
*1
communication. For details, refer to "5.2.1.4 Peer-to-Peer (P2P) Connection" in the Feature Guide.
Required Bandwidth per Call for Signalling
In a One-look network, a certain amount of bandwidth is required for the master unit to handle all the calls in
the network. The required bandwidth depends on the type of IP telephone.
Phone Type
IP Telephones (except SIP phones)
SIP Phone
Example:
The following examples show different cases of assessing bandwidth for a One-look network.
In this example, there are 3 PBXs in a One-look network.
IP Network A
Slave Unit A
- Number of Extensions: 100
- Extension Type: IP-PT
- Number of Simultaneous Calls: 26
Bandwidth assessment for IP network A:
•
Bandwidth required for VoIP communication
= Number of simultaneous calls ´ 2 ´ Required bandwidth for codecs (kbps)
= 26 ´ 2 ´ 80
= 4160 kbps
•
Bandwidth required for signalling
= Number of simultaneous calls ´ Signalling bandwidth per a call for IP telephones (except SIP phones)
(kbps)
= 26 ´ 7.2
= 187.2 kbps
•
Total required bandwidth for IP network A
= Bandwidth required for VoIP communication (kbps) + Bandwidth required for signalling (kbps)
= 4160 + 187.2
= 4347.2 kbps
20 ms
80 kbps
24 kbps
Master Unit
IP Network B
Slave Unit B
- Number of Extensions: 50
- Extension Type: SIP Phone
- Number of Simultaneous Calls: 12
Packet Sending Interval
30 ms 40 ms
74.7 kbps 72 kbps
18.7 kbps 16.0 kbps
Required Bandwidth
7.2 kbps
16.0 kbps
Codec: G.711
Packet Interval: 20 ms
7.4.1 One-look Network
60 ms
69.4 kbps
13.4 kbps
Installation Manual 241