Avaya B179 User Manual download pdf (Page 35)

Avaya B179 SIP Conference Phone Installation and Administration Guide

SRTP If set to disabled, the media is sent using RTP. Note that despite this

setting, the Avaya B179 will still use a secure channel if the opposite

device demands it.

If set to optional or mandatory, a padlock will be shown in the bottom

right-hand corner of the screen. If the other devices support SRTP, the

padlock will be locked. Otherwise, an open padlock will be displayed.

If set to mandatory, the call will not be connected if the other devices

do not support SRTP.

SRTCP Is automatically used when SRTP is enabled. Can be set to use encryp-

tation or not.

Secure signalling The SIP messages (signalling) and the SRTP cipher key are sent on a

dierent channel than the media and are not aected by the RTP/

SRTP setting. To ensure a secure connection, the signalling must be

secured using TLS or SIPS, see page 20. Note that the SIP transport

setting must be set accordingly.

On phone: > SETTINGS > ADVANCED > (PIN) > MEDIA > SECURITY (6,2,4,4).

RTCP Monitoring

Monitoring Host IP Address of the RTCP monitoring server.

All RTCP packets are sent to this host for monitoring.

If you use SRTP, unencrypted packets are sent to this host.

In the conguration le, update the IP address in the

<rtcp_monitoring_server_host> tag.

Monitoring Port The port of the RTCP monitoring server.

VAD

Voice Activity Detection (speech detection) is a technique used in speech processing to

detect the presence or absence of human speech in regions of audio. In VoIP applications,

VAD is mainly used to avoid unnecessary coding and transmission of silence packets, saving

on computation and network bandwidth.

On phone: > SETTINGS > ADVANCED > (PIN) > MEDIA > VAD (6,2,4,2).

DTMF

DTMF (Dual-tone multi-frequency) signalling is used for telephone signalling over the line to

the phone switch or PBX.

If the device itself generates the tones and they are sent in the voice-frequency band, the

method is called Inband. This is not the best method when using VoIP. Low bit rate

codecs may corrupt the signalling tones and make it dicult for the switch to identify them.

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Avaya B179 User Manual Page 35