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.
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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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