Other Parameters - HP MSR SERIES Configuration Manual

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The packet assembly interval is the duration to encapsulate information into a voice packet.

Bytes coded in a time unit = packet assembly interval × media stream bandwidth.

Packet length (IP) = IP header + RTP header + UDP header + voice information length = 20+12+8+data.

Packet length (IP+PPP) = PPP header + IP header + RTP header + UDP header + voice information length

= 6+20+12+8+data.

Network bandwidth = Bandwidth of the media stream × packet length/bytes coded in a time unit.

Because IPHC compression is affected significantly by network stability, it cannot achieve high efficiency

unless the line is of high quality, the network is very stable, and packet loss does not occur or seldom

occurs. When the network is unstable, IPHC efficiency drops drastically. With best IPHC performance,

the IP (RTP) header can be compressed to 2 bytes. If the PPP header is compressed at the same time, a

great deal of media stream bandwidth can be saved. The following table shows the best IPHC

compression efficiency of codec algorithms with a packet assembly interval of 30 milliseconds.

Table 225 Compression efficiency of IPHC+PPP header

Other parameters

Other parameters are some optional parameters, such as number selection priority, dial prefix, called

number sending mode, and DTMF transmission mode. For the description of these parameters,

Configuring other parameters of a local number

Configuring advanced settings of a local number

Configuring coding parameters of a local number

Select Voice Management > Local Number from the navigation tree, and then click the

local number to be configured to access the advanced settings configuration page.

Before compression

Packet length

(IP+PPP) (bytes)

After IPHC+PPP compression

Packet length

(IP+PPP) (bytes)

Configuring other parameters for a call

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