<html><body><div style="color:#000; background-color:#fff; font-family:tahoma, new york, times, serif;font-size:10pt"><div style="font-family: tahoma, 'new york', times, serif; font-size: 10pt; "><span style="font-weight: bold;">Hi Everybody,</span></div><div style="font-family: tahoma, 'new york', times, serif; font-size: 10pt; "><span><br></span></div><div><span><span style="font-family: tahoma, 'new york', times, serif; font-size: 10pt; ">I have a very tiny & crazy question but it is confusing me & I couldn't find its accurate answer over google that why we use </span><span style="font-family: tahoma, 'new york', times, serif; font-weight: bold; ">"!"</span><span style="font-size: 10pt; "> this before <span style="font-family: 'Courier New', courier, monaco, monospace, sans-serif;">mf_process_maxfwd_header</span> function in the main routing block. I have also seen this symbol with other functions like<span style="font-family: 'Courier New',
courier, monaco, monospace, sans-serif;"> !is_method("REGISTER|MESSAGE")</span> so what's its soul purpose?</span></span></div><div><span><span style="font-size: 10pt; "><br></span></span></div><div><span><span style="font-size: 10pt; ">How can I test the functionality of just the </span></span><span style="font-size: 13px; font-family: 'Courier New', courier, monaco, monospace, sans-serif;">mf_process_maxfwd_header</span><span style="font-size: 13px;"> function?</span></div><div><span style="font-size: 13px;"><br></span></div><div style="font-family: tahoma, 'new york', times, serif; font-size: 10pt; "> </div><div style="font-family: tahoma, 'new york', times, serif; font-size: 10pt; ">Regards,</div><div style="font-family: tahoma, 'new york', times, serif; font-size: 10pt; "><br></div><div style="font-family: tahoma, 'new york', times, serif; font-size: 10pt; "><span style="font-weight: bold;">Faisal
Rehman</span></div></div></body></html>