We currently have a large number of home based users using Avaya 9600 series VPN phones. The phoned build in IPSEC VPN to the outside interface of an ASA 5540. For the most part the phones work well but we often get reports of one-way audio problems. Never dropped calls just talk path issues.
My question is two-fold. I’m spinning up a new HA firewall pair to terminate new more VPN phones. My question is has anyone ran into this issue with the Avaya phones and audio problems and also would I possible benefit by lowering the MTU on the outside interface of the firewall? From some packet captures it looks like theses a reset going on when the audio problem happens. I’m wondering if the MTU size might help that issue.
We also have ANYConnect VPN session on the outside interface as well.
The ASA is setup for remote VPN access as if it was a remote VPN. Avaya has a good doc on setting it up. If I find it again, I'll repost it ASAP. What do the logs say on the Asa when trying to connect?
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We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...