Aastra Telecom 55I, 57I CT, 53I manual Real-time Transport Protocol RTP Settings on

Administrator Options

Administrator Level Options

Parameter In	Parameter in	Parameters in		Administrator
IP Phone UI	Aastra Web UI	Configuration Files	Description
N/A	Customized Codec	sip customized codec	Specifies a customized Codec
	Preference List		preference list which allows you to
			use the preferred Codecs for this IP
			phone.
			For more information, see Chapter
			4, “Real-time Transport Protocol
			(RTP) Settings” on page 4-64.
N/A	DTMF Method	sip dtmf method	Sets the dual-tone multifrequency
		(global)	(DTMF) method to use on the IP
			phone on a global or per-line basis.
		sip lineN dtmf method	Valid values are 0 (RTP), 1 (SIP
		(per-line)	INFO), or 2 (BOTH). Default is 0	Options
			follows:
			(RTP).
			For more information, see Chapter
			4, “Real-time Transport Protocol
			(RTP) Settings” on page 4-64.
N/A	RTP Encryption	sip srtp mode	This parameter determines if SRTP
		(global)	is enabled on this IP phone, as
		sip lineN srtp mode	• If set to 0, then disable SRTP.
		(per-line)
			• If set to 1 then SRTP calls are
			preferred.
			• If set to 2, then SRTP calls only
			are generated/accepted.
			For more information, see Chapter
			4, “Real-time Transport Protocol
			(RTP) Settings” on page 4-64.
N/A	Silence Suppression	sip silence suppression	Silence suppression is enabled by
			default on the IP phones. The
			phone negotiates whether or not to
			use silence suppression. Disabling
			this feature forces the phone to
			ignore any negotiated value.
			For more information, see Chapter
			4, “Real-time Transport Protocol
			(RTP) Settings” on page 4-64.

41-001160-00, Release 2.1, Rev 04 3-55