Security Features
197
Default
0
[1]
X is the account ID. X=1-8.
[2]
Y is the server ID. Y=1-2.
Secure Real-Time Transport Protocol (SRTP)
Secure Real-Time Transport Protocol (SRTP) encrypts the audio streams during VoIP phone calls to avoid interception
and eavesdropping. The parties participating in the call must enable SRTP feature simultaneously. When this feature is
enabled on both phones, the type of encryption to use for the session is negotiated between the IP phones. This nego-
tiation process is compliant with
.
When you place a call on the enabled SRTP phone, the IP phone sends an INVITE message with the RTP/RTCP encryp-
tion algorithm to the destination phone. As described in
, RTP/RTCP streams may be encrypted using an AES
(Advanced Encryption Standard) algorithm.
Example of the RTP encryption algorithm carried in the SDP of the INVITE message:
m=audio 11780 RTP/SAVP 0 8 18 9 101
a=crypto:1 AES_CM_128_HMAC_SHA1_80 >inline:NzFlNTUwZDk2OGVlOTc3YzNkYTkwZWVkMTM1YWFj
a=crypto:2 AES_CM_128_HMAC_SHA1_32 >inline:NzkyM2FjNzQ2ZDgxYjg0MzQwMGVmMGUxMzdmNWFm
a=crypto:3 F8_128_HMAC_SHA1_80 inline:NDliMWIzZGE1ZTAwZjA5ZGFhNjQ5YmEANTMzYzA0
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:18 G729/8000
a=fmtp:18 annexb=no
a=rtpmap:9 G722/8000
a=fmtp:101 0-15
a=rtpmap:101 telephone-event/8000
a=ptime:20
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.
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
Summary of Contents for W60P Telesystem
Page 1: ......
Page 18: ...Table of Contents 11 Appendix 255 RFC and Internet Draft Support 255...
Page 19: ...Administrator s Guide for W60P W53P W41P DECT Phones 12...
Page 47: ...40 Administrator s Guide for W60P W53P W41P DECT Phones...
Page 73: ...66 Administrator s Guide for W60P W53P W41P DECT Phones...
Page 123: ...116 Administrator s Guide for W60P W53P W41P DECT Phones...
Page 125: ...118 Administrator s Guide for W60P W53P W41P DECT Phones...
Page 139: ...132 Administrator s Guide for W60P W53P W41P DECT Phones...
Page 171: ...164 Administrator s Guide for W60P W53P W41P DECT Phones...
Page 193: ...186 Administrator s Guide for W60P W53P W41P DECT Phones...
Page 227: ...220 Administrator s Guide for W60P W53P W41P DECT Phones...
Page 253: ...246 Administrator s Guide for W60P W53P W41P DECT Phones...
Page 261: ...254 Administrator s Guide for W60P W53P W41P DECT Phones...