On Grandstream each ATA must have it's own SIP port if they are on the same LAN. 5060, 5061, 5062, etc... You can also try the setting "use random SIP port".
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On Grandstream each ATA must have it's own SIP port if they are on the same LAN. 5060, 5061, 5062, etc... You can also try the setting "use random SIP port".