I don't think my previous answer was very clear. Please, apologize for that.
Some time ago, I also asked for the same feature as yours :" to be able to send empty strings to IP phone Thomson ST2030". Tilghman Lesher from Digium was kind enough to code a patch for 1.4 (svn 187362). As unfortunately, I'm also using 1.6, I could test its patch nor I didn't dare to ask a port for 1.6. This doesn't help now for 1.6 but I thought it might help to be aware of that patch. Regards
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