06-08-2007 08:06 AM - edited 03-14-2019 09:58 PM
Can someone explain to me what the difference is between TLS and SRTP in the context of phone-to-phone encryption? Does TLS encrypt the RTP stream? What about when using SIP phones?
Thanks,
Chris
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06-08-2007 08:17 AM
Chris, You are almost there. TLS is the protocol used to encrypt RTP stream. Once RTP is encrypted, its called SRTP. TLS stands for transport layer security. TLS provides Integrity, Authentication and Encryption. TLS uses certificates. When a phone is configured from Non-secure to secure mode, a certificate is generated for that phone and installed on the phone. These are called LSCs.
These certificates are used for encrypting the signalling and voice payload. More details can be found in callmanager security guide.
HTH
Sankar
PS: please remember to rate posts!
06-08-2007 08:17 AM
Chris, You are almost there. TLS is the protocol used to encrypt RTP stream. Once RTP is encrypted, its called SRTP. TLS stands for transport layer security. TLS provides Integrity, Authentication and Encryption. TLS uses certificates. When a phone is configured from Non-secure to secure mode, a certificate is generated for that phone and installed on the phone. These are called LSCs.
These certificates are used for encrypting the signalling and voice payload. More details can be found in callmanager security guide.
HTH
Sankar
PS: please remember to rate posts!
06-08-2007 08:21 AM
Sankar
SIP phones support encryption the same way as SCCP phones, correct?
Thanks,
Chris
06-08-2007 09:48 AM
It works a little bit different with SIP phones, but basically the idea is the same. Signalling and media are encrypted. Check this link for more details.
06-10-2007 06:32 AM
Hi,
TLS is the protocol used to encrypt RTP stream
[SS] This is not corerct. TLS is for Signalling encryption.(Refer below)
SRTP for media encryption.
Thanks
SS
========
Table 1.2
Signaling Authentication/Encryption
TLS Mode: authenticated or encrypted
IPSec [authentication header, encryption (ESP), or both]
TLS Mode: authenticated or encrypted mode (SIP trunk only)
Media Encryption
SRTP
SRTP
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