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Avaya IP Office™ Platform in a Branch Environment Reference Configuration
Centralized SIP phone to IP Office PSTN trunk
Sunny day
In Sunny day, the following conditions must be met for the media session to use SRTP between the Centralized SIP phone and the IP Office:
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Signalling is done over TLS via Avaya Aura® Session Manager and the core Avaya Aura® Communication Manager
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Regardless of whether Communication Manager is configured for Initial Direct Media or IP-IP audio (shuffling), signaling and Media Encryption should be configured consistently on Communication Manager, the central Communication Manager Media Gateway, Session Manager, IP Office, and the Centralized SIP phone.
The media session flow uses SRTP between the Centralized SIP phone and the IP Office. IP Office connects and interworks the SRTP flow on the IP network side with the TDM media on the PSTN trunk. The following table describes the media flow for the possible call flow scenarios.
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Call flow scenario
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SRTP media flow
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Communication Manager is configured for Initial Direct Media
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SRTP media flows directly from the Centralized SIP phone  IP Office
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Communication Manager is configured for direct IP-IP audio (or shuffling), but not for Initial Direct Media
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Two stages:
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Rainy day
In Rainy day, the following conditions must be met for the media session to use SRTP between the Centralized SIP phone and the IP Office:
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Signalling is over TLS. In Rainy day, this is supported with 9600 Centralized SIP phones, but not with the Centralized SIP Avaya one-X® Communicator.
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Media Encryption is configured on the IP Office and on the Centralized SIP phone.
The media session flow uses SRTP between the Centralized SIP phone and the IP Office. IP Office connects and interworks the SRTP flow on the IP network side with the TDM media on the PSTN trunk.