GAI-Tronics VoIP Telephone Software Configuration Guide - Manual (Page 88)

GAI-TRONICS
VoIP Telephone Configuration Guide Page 88 of 88
11.4 Calls connect but there is no speech (or sound is garbled)
Audio problems are usually due to codec issues.
Check that both end points can use the same codec, and that nothing will prevent them
negotiating correctly. If necessary reduce the number of choices in the codec list (on the
AUDIO page) or change the preference order.
Also, particularly where bandwidth is limited, the network should be set to provide Quality of
Service (QoS) and/or to assign a high priority to voice traffic. It may be necessary to adjust
the RTPTOS field on the SIP page.
Ensure that the FRAMES and SAMPLE values are set correctly according to instructions in
section 5.13. Setting these values wrongly can cause speech to jitter.
12. Licensing Notices
The firmware in GAI-Tronics VoIP products contains modules subject to licensing and
copyright as follows:
Module
License
u-boot
GPL V2
Linux kernel GPL V2
Busybox GPL V2
Opal/PWLib Mozilla Public License V1.1
Modutils GPL V2
MTD GPL V2
NTP David L. Mills Copyright Notice
These licence and copyright notices are available in full from our website at
www.gai-tronics.co.uk/voipsupport.htm
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