VTech ET685 Administrator And Provisioning Manual page 133

Setting
Packet Size
Filtered codec list
Full SDP Answer
Symmetrical RTP
RTP Encryption
Dynamic G.726 payload
G.726 Byte Order
Web User Interface (WebUI) Reference
ET685 Administrator and Provisioning Manual
Description
Select the packet size in ms.
Please note that the following codecs only work with certain
packet time values:
g723: 30 or 60 ms

gsm: 20,40 or 60 ms

comma separated list of all configured codecs for this
identity. All valid codecs are black and invalid codecs (e.g.
configured with not supported packet size or wrong name)
are red and crossed out.
When the setting is turned 'on', the phone returns a list of all
available codecs in the SDP in response to INVITE
requests. Otherwise the first codec of the calling party that
matches the configured codecs on the phone is returned.
This setting tells the phone to always send RTP packets to
the same IP and port from where it receives them. It ignores
the port which the remote party sent in the SDP details. If the
two incoming and outgoing RTP (audio) streams of a single
call should use the same port number, turn this setting on.
Your phone supports RTP encryption via SRTP. If you want
to encrypt your outgoing audio (RTP) stream, this option
must be "on". Both parties have to enable the RTP
Encryption option to establish an SRTP call. RTP encryption
has nothing to do with SSL/TLS. The keys are sent in the
SDP part of SIP messages. Certificates are not used for
this. In FW Version 6 the default value is off, you have to
switch it to on in order to have SRTP enabled. Then, a small
lock sign is shown on the display if STRP is active during a
call, this means that an SRTP encrypted call is currently
taking place. In FW Version 7 the default value is on. In
order to obtain full security SIP call you have to use TLS as
well. Then, a small lock sign is shown on the display which
means that an secure SIP call is currently taking place (SIP
secured + RTP encrypred).
Turns on dynamic payload type for G726. This setting
becomes obsolete from FW version 8.7.2 onwards
There are two types of byte order for G.726, namely
RFC3551 and AAL2. With this setting you can choose the
byte order in order to use the same order as the remote
entity. Note: this setting has no effect on codec:
AAL2-G726-32 !
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