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Third Party SIP Client and ASA Phone Proxy

Can a third party sip client (eg. xlite) on the Internet securely register to UCM (using digest authentication) via the ASA Phone Proxy feature?

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Re: Third Party SIP Client and ASA Phone Proxy

Highly unlikely. The ASA Phone Proxy utilizes a certificates-based TLS tunnel between the phone and the ASA. To my knowledge, there are no third-party phones that support the mixed-mode encryption that Cisco has designed for this feature. I would suggest a IPsec or SSL-based VPN connection which would abstract this from the soft phone.

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