Firewall - how to test if blocked

I'm working (still - thanks for the previous answers) on getting my client to open their firewall so that tropo/phono can work. Are there any simple things I can do to illustrate that their firewall is, for example blocking port 1935? For example, there might be something like (provided by another vendor, ahem, "telnet chunder.twilio.com 1935" - which failed btw.) If you had a nice web page that did some simple tests - that would be even more wonderful. Thanks! p


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