I have written many applications for my IP phones. Occassionally when I'm moving from one page to another using my phone softkeys the phone will just display "Requesting..." in the lower left. After exactly 2 minutes the screen that it is trying to go to will display. Then the phone will work fine for awhile again. The time is always exactly 2 minutes. Has anyone ever seen this? Is there a way to tune this timeout value? Does anyone know what the phone is waiting for?
I am running version 3.2 of the Call Manager. This is just set up in a test environment where everything is on the same LAN. The web server doesn't even have to do DNS queries for this. Most of the displays on the phone are just canned data put into XML phone objects. So all that should be do is to go load the next page. Most of the time I get the 2 minute timeout (and it's EXACTLY 2 minutes every time) is when I press the Exit softkey. Which should just take me back to the previous screen.
I thought I remembered reading something about this timeout being tuneable...
Yes, the call stack is tunable. If you put an "expires = -1" header on a page, that page is not added to the stack, so the Exit softkey will skip over that page when returning to a previous page.
Are the URLs you use in your XML pages using IP addresses instead of host addresses? In that case, the DNS server would be bypassed. The fact that it's a 2 minute delay sure seems to indicate a timeout of some sort.
Is moving forward through the XML screens working okay, or do you occasionally get a timeout there? Might there be one url that uses hostname somewhere? Can you narrow it down to a subset of screens that are slow loading or returning via Exit?
Do the computer that did the test browsing and the IP Phone both have the same DNS server settings?
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