Yealink VC110 - Page 278

Administrator’s Guide for Yealink VC110 Video Conferencing Endpoint
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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 endpoint 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—do not use SRTP in SIP calls.
 Optional—negotiate with the far site
whether to use SRTP for media
encryption in SIP calls.
 Compulsory—compulsory use SRTP for
media encryption in SIP calls.
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
When SRTP is enabled on both endpoints, RTP streams will be encrypted, and the lock icon