Administrator’s Guide for SIP-T2xP IP Phones
468
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.
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
SRTP is configurable on a per-line basis. When SRTP is enabled on both IP phones, RTP
streams will be encrypted, and a lock icon appears on the LCD screen of each IP
phone after successful negotiation.
Note
Procedure
SRTP can be configured using the configuration files or locally.
Configuration File
<MAC>.cfg
Configure SRTP feature on a
per-line basis.
Parameter:
account.X.srtp_encryption
account.X.srtp_auth_tag_mode
Local
Web User Interface
Configure SRTP feature on a
per-line basis.
Navigate to:
http://<phoneIPAddress>/servl
et?p=account-adv&q=load&ac
c=0
If you enable SRTP, then you should also enable TLS. This ensures the security of SRTP
encryption. For more information on TLS, refer to
Transport Layer Security
on page
457
.
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