I have recently set up a Lan-to-Lan ipsec tunnel between our corporate Cisco ASA 5520 firewall and a remote office with a Cisco ASA 5505 over DSL. Tunnel is up fine, all data is working normally. My problem lies in the Avaya 4620 ip phones I have behind the ASA 5505 at the remote office. Voice quality over the connection is great but we have continual issues with the phones I believe to be a voice signaling issues. Some of the symptoms include:
1.) Slow response on the phone to get a dial tone.
2.) delays from the phone to register that the receiver has been hung up.
3.) Calls dropping completely in the middle of a call.
4.) Calls ringing through to the phone, but when picked up, no dial tone, and they cannot get the call.
This one has me puzzled. We do have approx 20 telecommuters who use the avaya vpn remote phone which terminates to the corporate firewall and those phones have no issues what-so-ever. I have my ipsec tunnel configured between the coporate office and the remote office with the same ike and ipsec parameters as the avaya vpn remote phones yet for whatever reason the phones behind that asa at the remote office are really not functioning as I projected they would. Has anyone run into this and can give me a few ideas. Thank you all in advance for your assistance, as always, its greatly appreciated. Cheers!