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: 18.104.22.168/30816 :: client ip 22.214.171.124/24048
Media-session: 126.96.36.199/21616 :: client ip 188.8.131.52/0
Lcl RTP conn 184.108.40.206/28198 to 220.127.116.11/0 tx_pkts 0 rx_pkts 0
Media-session: 18.104.22.168/17732 :: client ip 22.214.171.124/27686
I also saw that a bunch of discards when the call is answered:
Aug 12 11:56:18 10.94.4.100 %ASA-7-710005: UDP request discarded from 126.96.36.199/30122 to outside:188.8.131.52/28198
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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