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  1. lyson123

    SIP ext to SIP ext calls

    hi guys @Shieldsy, this isn't entirely true. as long as you open correct ports on your firewall, and find a way to handle NAT traversal on from the SIP phone side, SIP phone will work off site without VPN, that's basic networking. Besides, issue applies to phones both onsite and off site. SIP...
  2. lyson123

    SIP ext to SIP ext calls

    Hi, I'm new here, but need help. Here's the scenario: NCP500 with approx 10 DT343 phones, NT343's couple of PS (5 I guess) and off site 5 SIP exts ( Grandstream GXV3140 ) got it setup to handle SIP calls through NAT and firewall, I can dial out through all SIP trunks and POTS lines from all...

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