VP-12, VP-12P IP phones. Operation manual
46
DTMF Transfer
– mode of DTMF signal transmission:
•
Inband
– inband transmission;
•
RFC2833
– according to RFC2833 recommendation as a dedicated payload in RTP voice packets;
•
SIP
info
– transfer messages via SIP in INFO requests.
•
RFC2833 Payload Type
– payload type for packet transmission via RFC2833 (permitted values: from 96
to 127).
•
Use the Same PT Both for Transmission and Reception
– option is used in outgoing calls for payload type
negotiation of events sent via RFC2833 (DTMF signals). When selected, event transmission and
reception via RFC2833 is performed using the payload from 200Ok message sent by the opposite side.
When unselected, event transmission is performed via RFC2833 using the payload from 200Ok being
received, and reception—using the payload type from its own configuration (specified in the outgoing
Invite).
•
Silencedetector
– when selected, enable voice activity detector.
•
Echocanceller
–
when selected, use echo cancellation.
•
Dispersion Time, ms
– parameter that cancels an echo caused by the voice signal dispersion. Parameter
values may be specified in the interval from 2ms to 128ms.
•
RTCP
– when selected, use RTCP for voice link monitoring.
•
Sending Interval
– RTCP packet transmission period, in seconds;
•
Receiving Period
– RTCP message reception period measured in transmission period units; if there
is not a single RTCP packet received until the reception period expires, VP-12(P) will terminate the
connection.
•
RTCP-XR
– when selected, RTCP Extended Reports will be sent according to RFC 3611.
RTP
•
Min RTP Port
– lower limit of the RTP ports range used for voice traffic transmittion.
•
Max RTP Port
– upper limit of the RTP ports range used for voice traffic transmittion.
SRTP
•
Enable
– when selected,
RTP flow encryption is used. Thus, the RTP/SAVP profile will be specified in
SDP of outgoing INVITE requests. Also, the SDP of incoming requests will be scanned for the RTP/SAVP
profile. If the RTP/SAVP profile is not found, the call will be rejected.
•
Crypto Suite
1-2 – allows to choose encryption and hashing algorithms to be used. A suite with the
highest priority should be specified in “Crypto Suite 1” field. You have to specify at least one crypto suit:
• AES_80 – according to AES_CM_128_HMAC_SHA1_80;
• AES_32 – according to AES_CM_128_HMAC_SHA1_32.
