try with a packet capture with wireshark or so to see what is communicated
between phone and webserver


On Tue, Feb 26, 2013 at 4:56 AM, Cisco Developer Community Forums <
cdicuser@developer.cisco.com> wrote:

> Levent Ozturk has created a new message in the forum "IP Phone Services
> Questions": --------------------------------------------------------------
> Hi everyone,
> We have a custom directory service that is working fine on 6941 and 8945
> but we have problems when with 9971.
> Whenever I make a search in the directory service with no criterias given
> (no name, no surname, nothing) I always get a "HTTP Error [500]!" error.
> Where can I start to look for the problem?
> Thanks for your help.
> Levent
> --
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> http://developer.cisco.com/web/ipps/community/-/message_boards/view_message/12353134or simply reply to this email.

Some models handle un-specified input values differently.  For example, with a input fields 'requiredValue' and 'optionalValue', if the user submits the screen without putting anything into the optional field, the phone may request either:
GET /myService?requiredValue=something&optionalValue=
or
GET /myService?requiredValue=something

This makes a difference in the server-side script, as 'if (optionalValue=="")' might work for the former, but won't for the latter (the optionalValue param was never received and is 'undefined'.)  You will want to check if optionalValue!=undefined before assuming it has any value (including empty string)

The behaviour is phone/firmware specific and not configurable.  Just a guess as to whether this is the actual problem.  We can perhaps gain some more insight by comparing a network packet capture of a working vs non-working phone - and of course identifying the nature of the failure in the application script (on IIS?) would be the primary troubleshooting avenue.

Yep, so your script will need to handle this possibility, i.e. parameter being missing results in the same script action as if parameter is missing but null/empty