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Administrator’s Guide for Yealink VC800&VC500 Video Conferencing System
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a=sendrecv
The callee receives the INVITE message with the RTP encryption algorithm, and then answers the
call by responding with a 200 OK message which carries the negotiated RTP encryption
algorithm.
The following is an example of the RTP encryption algorithm carried in the SDP of the 200 OK
message:
m=audio 11780 RTP/SAVP 0 101
a=rtpmap:0 PCMU/8000
a=rtpmap:101 telephone-event/8000
a=crypto:1 AES_CM_128_HMAC_SHA1_80 inline:NGY4OGViMDYzZjQzYTNiOTNkOWRiYzRlMjM0Yzcz
a=sendrecv
a=ptime:20
a=fmtp:101 0-15
The SRTP parameter on the system is described below:
Parameter
Description
Configuration Method
SRTP
Specifies the SRTP type. You can configure it
for the Zoom/Pexip/BlueJeans/Mind/Custom
platform, SIP account or SIP IP call
separately.
Disabled
—encrypted calls are not
supported.
Optional
—both encrypted and
unencrypted calls are supported.
Secure calls are supported only if the
far end supports encryption.
Compulsory
—unencrypted calls are not
supported.
Default:
Disabled
Note:
You cannot configure it for the
Yealink/StarLeaf Cloud platform.
Web User Interface
Rules of SRTP for media encryption in SIP calls:
Far Near
Compulsory
Optional
Disabled
Compulsory
SRTP Call
SRTP Call
Fail to establish call
Optional
SRTP Call
SRTP Call
RTP Call
Disabled
Fail to establish call
RTP Call
RTP Call
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