Agilent Technologies N2620A - Manual (Page 111)

Voice Testing with the FrameScope Pro 3
N2620A User’s Guide 93
How the FrameScope Pro Tests Voice Quality
You can use the FrameScope Pro VoIP test feature to test the
voice quality and measure audio circuit characteristics as
follows.
• The FrameScope Pro VoIP test feature places and answers
one telephone call at a time to establish a voice connection.
This voice connection (including the transmission media and
equipment of which it is a part of) becomes the
network- under- test
. The FrameScope Pro VoIP works like a
telephone or other telephony device positioned at the ends of
voice circuits.
• Once the FrameScope Pro VoIP test feature has established a
call, it transmits audio RTP packets into the network and
measures the effect of the transmitted packets when they
travel through the network-under-test.
Test Port Settings
The FrameScope Pro VoIP Service Quality Testing feature can
connect to the network using Point-to-Point-Protocol Over
Ethernet (PPPoE) or IP Over Ethernet (IPoE). These settings are
available in the Test Port Settings screen, as described in
Chapter 7 , “Test Port Settings” on page 171.
Audio Codec Support
For measurement results which resemble the end-user
experience when testing a VoIP service, you need to use the
appropriate codec. The FrameScope Pro supports the following
codecs.
• G.711 A-law
• G.711 μ-law
• G.721 (G.726-32K)
• G.723.1
• G.726 with 16 kbps, 24 kbps, and 40 kbps
• G.729A, G.729B