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

IP Phone Administrator Guide Administrator Level Options

Administrator Options

RTP Settings

You can configure the following RTP settings.

Parameter In	Parameter in	Parameters in	Description
IP Phone UI	Aastra Web UI	Configuration Files
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 page 4-64.
N/A	Basic Codecs	sip use basic codecs	Enables or disables basic codecs.
	(G.711 u-Law,		Enabling this parameter allows the
	G.711 a-Law, G.729)		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 page 4-64.
N/A	Force RFC2833 Out	sip out-of-band dtmf	Enables or disables out-of-band
	of Band DTMF		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 page 4-64.

3-54 41-001160-00, Release 2.1, Rev 04