MobiLink IP
VoIP
MobilinkIP_Usermanual-sw1.2.21_revGen.doc
Page 107 of 188
6.6.4
DTMF Settings
Settings for sending out DTMF in VoIP calls made over MobiLink IP:
This configuration area establishes the means of sending out DTMF into the VoIP calls.
There are several methods available, which may be used at the same time. Transmission of
DTMF signaling can be done in band, out of band in RTP packets, or sending out INFO
messages (as digital telephone-events). Additionally, when using the H323 protocol, you can
choose to transmit DTMF by using the H.245 Alphanumeric method.
Under the SIP protocol, the INFO method would be used for carrying of mid-call signaling
information along the session signaling path (for example to send the DTMF digits generated
during a SIP session). Check the box “SIP Info” for this way of transmitting DTMF.
When checking this “RFC 2833” options, also complete the next Parameters fields to the
right
-
payload type for DTMF in RTP (according to RFC 2833)
-
redundancy payload type
-
Redundancy scheme: either IETF or AAL2.
