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Administrator’s Guide for SIP-T2 Series/T19(P) E2/T4 Series IP Phones

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2. Click Browse to select the certificate (*.pem and *.cer) from your local system.

3. Click Upload to upload the certificate.

A dialog box pops up to prompt “Success: The Server Certificate has been loaded!

Rebooting, please wait…”.

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 utilize for the session is negotiated between the IP phones. This

negotiation process is compliant with RFC 4568.

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

RFC 3711, 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

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