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SIP - Encrypted trunk to Unencrypted trunk fails

mzajeski
Level 1
Level 1

‎05-24-2018 08:06 AM - edited ‎03-17-2019 12:52 PM

We have a voice PRI connected to an ISR 4451.  The ISR is configured in CallManager using encryption/tls as a SIP Trunk (5061).  We also have an IVR configured using SIP, but without encryption (5060).

 

When calling the IVR directly, the call proceeds.  When calling a did on the PRI that translates to the IVR, it fails.  I've tried fronting with a MTP to no avail.  The call is completely G711.  Any suggestions for troubleshooting?

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2 Replies 2

mzajeski
Level 1
Level 1

‎05-24-2018 08:10 AM

I forgot to mention - when I turn off encryption on the ISR 4451, the call works.  So the issue has something to do with the scenario -

 

PSTN -- 4451 (SIP TLS/5061) -- CallManager -- IVR (SIP/5060)

0 Helpful

gmgarrian
Level 4
Level 4
In response to mzajeski

‎05-24-2018 01:49 PM

Are you doing SRTP as well or just TLS?

 

If so, you'll need to configure srtp fallback since the IVR is not secure:

 

https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/voice/sip/configuration/15-mt/sip-config-15-mt-book/voi-sip-srtp.html#GUID-707A5070-4311-4A78-959E-D5F8B246188A

 

 

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