MP-20x
Release Notes 12 Document #: LTRT-50511
2.3 Known Limitations in Version 2.6.3
Version 2.6.3 includes the following known limitations:
MP-203B/2FXS/1FXO includes the following known limitations:
• The first configured VoIP codec is also used internally for calls between the local phone and
the PSTN. If a codec other than G.711 is configured as the first codec, then voice quality
degradation occurs in PSTN calls.
• DTMF transport over SIP should not be selected.
• FXO ring detection does not support all possible ring cadences.
• When the user answers a waiting PSTN call during a VoIP call, it is not possible to return to
the VoIP call.
Faxes can only be sent between two local lines if the selected fax transport mode is Transparent
(in G.711).
The Web interface is not automatically refreshed during the firmware upgrade process.
After the dial tone timeout has expired (and a fast-busy tone is played), the user can still make an
outgoing call.
A silence period of about three seconds occurs after pressing the ‘Flash’ key during a conversation
(normally, the user presses ‘Flash’ + ’1’, ‘Flash’ + ’2’, or ‘Flash’ + ’3’). This limitation does not occur
when in ”Flash only” key sequence mode.
QoS traffic shaping: Enabling ‘TCP Serialization’ may cause problems viewing real-time video
streams on a PC that is connected to the device.
Caller ID Type II audio indication is sometimes heard by both the calling and the called parties. The
remote side doesn't hear the FSK; only an RFC 2833 DTMF tone.
To ensure that the OPTIONS Keep-Alive feature is fully functional, the remote side must send any
message, including the “501 Not implemented” SIP message.
Enabling or disabling the Periodic Checking of Configuration File feature requires a device reboot.
A SIP NOTIFY message with a “check-sync” event with a message body causes a device restart
even if there are ongoing conversation calls.
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