I have a Hitachi WirelessIP5000 phone (the original 1st gen hardware). It's running the latest firmware (v2.2.6) and my Asterisk server is running 1.2.10. This setup has been working great for me for a long time, and then last week I started having a problem where the Hitachi phone loses registration. It registers fine when I first power it on, but at some point later the display shows "Not Register" and the phone never attempts to re-register after that. The length of time depends on the expire setting. If I press the "Register" soft key on the phone, it re-registers fine, only to lose registration again later on. I have not made any config changes to the phone. I have made some extensions.conf changes on the Asterisk server, but I can't think of any way that would cause this problem.
I did look at a packet trace of the SIP communication between the phone and server. SIP registration expire is set to 60 seconds. When the phone first powers up, it sends a SIP REGISTER without an "Authorization:" header. The Asterisk server replies with "401 Unauthorized." The phone immediately sends another REGISTER with the "Authorization:" header included and succeeds. At 30 seconds after power up, the phone sends another REGISTER without "Authorization:" and gets "401 Unauthorized" and then immediately retries, again without the "Authorization:" header. At 60 seconds after power up, the phone's display changes to "Not Register" and it never tries to register again unless I press the "Register" key or power cycle the phone. Anyone have any idea what could be going on here? I have tried downgrading the phone's firmware to v2.1.11 and had the same problem. I have not tried upgrading to a newer version of Asterisk, but seems like that shouldn't be necessary since thing were working fine before. Any help appreciated.
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