Aastra Telecom 53I, 55I, 57I, 57I CT RTP Settings You can configure the following RTP settings.

Administrator Level Options
3-54 41-001160-00, Release 2.1, Rev 04
IP Phone Administrator Guide
Administrator Options
RTP Settings
You can configure the following RTP settings.
Parameter In
IP Phone UI
Parameter in
Aastra Web UI
Parameters in
Configuration Files Description
RTP Port Base RTP Port sip rtp port The RTP port is used for sending
DTMF tones and for the audio
stream. Your network administrator
may close some ports for security
reasons. You may want to use this
parameter to send RTP data using a
different port. Default is 3000.
For more information, see Chapter
4, “Real-time Transport Protocol
(RTP) Settings” on page4-64.
N/A Basic Codecs
(G.711 u-Law,
G.711 a-Law, G.729)
sip use basic codecs Enables or disables basic codecs.
Enabling this parameter allows the
IP phone to use the basic Codecs
when sending/receiving RTP
packets. Valid values are 0
(disabled) and 1 (enabled). Default
is 0 (disabled).
For more information, see Chapter
4, “Real-time Transport Protocol
(RTP) Settings” on page4-64.
N/A Force RFC2833 Out
of Band DTMF
sip out-of-band dtmf Enables or disables out-of-band
DTMF. Enabling this parameter
forces the IP phone to use
out-of-band DTMF according to
RFC283. Valid values are 0
(disabled) and 1 (enabled). Default
is 1 (enabled).
For more information, see Chapter
4, “Real-time Transport Protocol
(RTP) Settings” on page4-64.