Specifications

TD 92326GB
2009-03-10 / Ver. E
Installation and Operation Manual
VoIP Gateway
167
In any case, the maximum size of packets transmitted over the WAN link (often referred to
as MTU Size) should be restricted to a value smaller than 800 bytes. This ensures that, in
spite of the prioritisation of voice data, larger data packets do not block the line for an
extended period of time during transmission.
Some routers are able to prioritize but are unable to interrupt the transmission of larger
packets once it has started. This can result in poor quality in spite of prioritisation. In such
a case, check whether this interruption can be separately enabled. Some routers refer to
this function, somewhat confusingly, as interleaving.
B.3 If Technical Support is required
Please have the following information on hand whenever you need to contact your dealer
for support:
• The entire configuration as displayed by Diagnostics > Config show.
• A trace which shows the error situation (Diagnostics > Trace).
• The complete version identifier of your VoIP Gateway. You can find it on the VoIP
Gateway's welcome page.
• The serial number. You can find it on the serial number label which is on the bottom of
the device or on the VoIP Gateway's welcome page.