Mitel 6800i Series Administrator's Manual page 228

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Mitel 6800i Series SIP Phone Release 4.1.0 Administrator Guide

The matrix below details DTMF behavior when the out-of-band DTMF and DTMF method

settings are configured in various scenarios:

WEB UI SETTING/CONFIGURATION

PARAMETER SETTING

SIP INFO (1)

RTP ENCRYPTION

The IP Phones include support for Secure Real-time Transfer Protocol (SRTP), using Session

Description Protocol Security (SDES) key negotiation, for encryption and authentication of

RTP/RTCP messages sent and received by the Mitel IP phones on your network.

As administrator, you specify the global SRTP setting for all lines on the IP phone. You can

choose among three levels of SRTP encryption, as follows:

SRTP Disabled (default): IP phone generates and receives non-secured RTP calls. If the

IP phone gets called from SRTP enabled phone, it ignores SRTP tries to answer the call

using RTP. If the receiving phone has SRTP only enabled, the call fails; however, if it has

SRTP preferred enabled, it will accept RTP call.

SRTP Preferred: IP phone generates RTP secured calls, and accepts both secured and

non-secured RTP calls. If the receiving phone is not SRTP enabled, it sends non-secured

RTP calls instead.

SRTP Only: IP phone generates and accepts RTP secured calls only; all other calls are

rejected (fail).

You can override the global setting as necessary, configuring SRTP support on a per-line basis.

This allows IP phone users to have both secured and unsecured lines operating on the same

When an active call is using SRTP (i.e. when an SRTP enabled IP phone initiates a call and

the receiving phone is also SRTP enabled) and the transport protocol is set to TLS, the IP

Phone UI displays a "lock" icon, indicating that the call is secure. If one of the phones does not

DTMF BEHAVIOR

FORCE RFC2833

OUT-OF-BAND DTMF/

SIP OUT-OF-BAND

Disabled (0)

Disabled (0)

Disabled (0)

IN-BAND DTMF

DTMF (RFC2833)

Troubleshooting