ZyXEL Communications P-2302HWDL-P1 Support Notes page 69

Step 2: Access the web configurator and click VoIP > Advance Setting.
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Select the "primary compression to G.729" and "DTMF mode to SIP info" options
Step 3: Click VoIP > Trunking and select to enable trunking. You can also enable auto attendant
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authentication if pin code authentication is required before using the trunk.
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Prestige 2302 Support Notes
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69