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3Com OfficeConnect (3CREVF100-73-ME) Firewall - Page 3 Questions & Answers
3COM 3100 entry phone, how to configure SIP
From Digium Mailing List:
3Com 3100 series phones do not support SIP with non-3Com systems. They have a basic boot loader which must download code from a 3Com NBX or a 3Com VCX system. If you don't have either of these, then you won't get runtime code on the phone, thereby making it impossible to use the thing with Asterisk.
Asterisk Users 3Com Phones
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There could be a lot of reasons, one is port blocking, the other is firewall, there caould also be NAT port issues, what modem and internet provider do you have could be the problem.
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