Administrator’s Guide for SIP-T2 Series/T19(P) E2/T4 Series/T5 Series IP Phones
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To configure the server certificates via web user interface:
1.
Click on
Security
->
Server Certificates
.
2.
Select the desired value from the pull-down list of
Device Certificates
.
3.
Click
Confirm
to accept the change.
To upload a server certificate via web user interface:
1.
Click on
Security
->
Server Certificates
.
2.
Click
Browse
to select the certificate (*.pem and *.cer) from your local system.
3.
Click
Upload
to upload the certificate.
Secure Real-Time Transport Protocol (SRTP)
Secure Real-Time Transport Protocol (SRTP) encrypts the RTP 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 negotiation process is compliant with
When a user places a call on the enabled SRTP phone, the IP phone sends an INVITE message
with the RTP encryption algorithm to the destination phone. As described in
, RTP
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
Summary of Contents for SIP-T19 E2 T4 Series
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Page 887: ...Troubleshooting 865 The phone begins rebooting Any reboot of the phone may take a few minutes ...
