/mcp• Check Allow Activation Code via MRA check box. • From the Activation Code MRA Service Domain drop-down list, choose the required MRA service domain. For more information on how to configure the MRA service domain see, the MRA Service Domain Configuration section in System Configuration Guide for Cisco Unified Communications Manager. Note For SIP OAuth over MRA mode, use only activation code and do not use username/password based login. Step 4 In the Protocol Specific Information section, choose the OAuth enabled SIP profile from the Device Security Profile drop-down list. Make sure that the phone supports OAuth firmware. For more information, on how to create a security profile, see Configure Phone Security Profile section in System Configuration Guide for Cisco Unified Communications Manager. Step 5 Click Save and Apply Configuration. Note The phone switches to MRA mode and initiates communication with the Expressway. If your internal network does not allow communication with Expressway from on-premises, the phone doesn't register but is ready to contact Expressway when it's powered up off-premises. Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs 803 Advanced Call Processing Configure SIP Oauth Registered Phones for MRA Mode