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ASA phone-proxy users behind loadbalanced internet services.


I have a handful of remote users in an office that are registering to my CUCM cluster via an ASA phone proxy.  The recently started complaining of intermittent no-audio issues.  I noticed that on failed calls the extermal media leg was showing up as RTP, not SRTP:

phone-proxy-2#  sh phone-proxy media-sessions

Media-session: :: client ip

Media-session: :: client ip

  Lcl RTP conn to tx_pkts 0 rx_pkts 0

Media-session: :: client ip

I also saw that a bunch of discards when the call is answered:

Aug 12 11:56:18 %ASA-7-710005: UDP request discarded from to outside:

So, apparently, this office recently had new internet service installed, and it appears that they are running 2 connections in a Loadbalanced / Active-Active configuration.  On that assumption, it looks like the media streams are sometimes being sent out the wrong internet link and getting nat'ed to a different IP than the SCCP signaling. 

Is there any way to work around this?  Or am I going to have to get this office to reconfigure their internet to a Failover configuration to avoid this behavior?

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