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Incoming SIP Trunk Authentication Netvanta

I'm configuring a Netvanta 3140 for a customer.  It is functioning as an SBC between their Asterisks IP PBX and a SIP service provider. They want to enable Digest Authentication in both directions between the Adtran and their PBX.  I can authenticate outbound calls to the PBX by configuring the 'Authentication Username XXX Password XXX' command under the Trunk configuration, but I haven't found a way to enable basic MD5 authentication for SIP calls to the Adtran from the Asterisks.  Is this possible?  Thoughts?


Thanks to all with helpful suggestions.

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