A fast question about SRTP

I see calls via sip-tosip are protected by SRTP(sip show channel…) but the calls versus isdn phones are RTP only.
The question is simple: is possible to use SRTP on dahdi analog or isdn phones?

Each call leg is independent for SIP. If calling out a DAHDI analog trunk, for example, then the SIP side would be encrypted using SRTP but the DAHDI side would be unencrypted. There is no encryption for DAHDI or ISDN.


Did you mean for RTP?

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The same applies for RTP. More generalized would be “each call leg is independent regardless of technology”.


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