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To dial out an SIP call, please dial the trunk number for SIP Trunk (e.g., dial 001 if you want
to use iptel SIP account) first and then dial the SIP number of the peer.
To dial out an ISDN call, please dial the extension number (e.g., 904) for ISDN TE port first
and then the ISDN number of the peer.
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VigorIPPBX 2820 Series User's Guide
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