June 2005
Intermediate to advanced
502 pages
21h 48m
English
Content preview from Switching to VoIP
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Interoperability
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261
To resolve the simulated incompatibility, remove the md5secret token from sip.conf
and attempt to place a call with the X-Lite softphone again.
Troubleshooting Quality-of-Service Issues
Not all troubleshooting situations involve signaling. As you may have read in prior
chapters, noise problems and dropouts stemming from jitter and packet loss are
cause for troubleshooting. Fortunately, the standards for sound transmission—RTP
and codecs—are simple compared to call signaling, so troubleshooting sound issues
is generally easier.
That’s not to say all sound-related issues are a snap to dismiss. Sound issues are
affected by many disciplines of networking: switching, routing, QoS, and packetiza-
tion. The way congestion on a routed link shows up is in dropouts, or in busy sig-
nals if you’re using a QoS solution. On a switched link, like Ethernet, busy signals
may occur long before dropouts are perceptible. So symptoms are different on differ-
ent links.
As with signaling, good diagnostic logging is valuable for troubleshooting. Packet
analysis is less useful when examining sound quality problems. One can certainly
identify jitter using packet capture, but it’s just easier to identify jitter across IP links
using tools like traceroute and pathping, which succinctly show ...
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