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A debug of the traffic that you are seeing from the phones would be helpful. Off the top of my head i have found issues with access lists, QoS as the biggest culprits in these situations. Also just wondering, is the Avaya hardware on the inside or in a DMZ? 
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A debug of the traffic that you are seeing from the phones would be helpful. Off the top of my head i have found issues with access lists, QoS as the biggest culprits in these situations. Also just wondering, is the Avaya hardware on the inside or in a DMZ?

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The avaya hardware is on the inside.
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I also wanted to add that there is no other traffic going through this ASA other than the Phones. Would you still suggest QoS for that? If so how would I go about doing that?
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I also wanted to add that there is no other traffic going through this ASA other than the Phones. Would you still suggest QoS for that? If so how would I go about doing that?

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I have an ASA5505 with Avaya 9620 phones connected remotely as VPN Peers. The phones are having quality issues as well as keep reseting at random times. The phones that are geographically further away from the ASA seem to be having a harder time with everything. Is there anyway to make them more stable? 
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I have an ASA5505 with Avaya 9620 phones connected remotely as VPN Peers. The phones are having quality issues as well as keep reseting at random times. The phones that are geographically further away from the ASA seem to be having a harder time with everything. Is there anyway to make them more stable? 

ASA5505 and Avaya 9620

Cisco PIX is a dedicated hardware firewall appliance; the Cisco Adaptive Security Appliance (ASA) is a firewall and anti-malware security appliance that provides unified threat management and protection the PIX does not. Other Cisco devices and systems include routers, switches, storage networking, wireless and the software and hardware for PIX Firewall Manager (PFM), PIX Device Manager (PDM) and Adaptive Security Device Manager (ASDM).