When can I use which provisioning method?
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The guide below outlines the provisioning methods which shall be used for Supported IP Phones only. For legacy phones follow the instructions defined with the provisioning guide itself.
Supported IP phones have a vast amount of possible provisioning methods which are depended on the phone’s locality. Choose the matching setup of your installation and see which provisioning method should be used:
Phone Locality: Same Subnet as PBX
In this setup combination the phone shall be provisioned via P’n’P method as the multicast messages can be intercepted by the 3CX Phone System even when 3CX is not running on SIP port 5060 (since V15.5 SP2).
Phone Locality: Other Subnet as PBX
In this setup combination the phone must be provisioned via the manual provisioning method as multicast messages will not traverse via router boards making it for 3CX impossible to intercept those announcements.
Phone Locality: On VPNed Network (Lan2Lan)
Refer to “Phone Locality: Other Subnet as PBX” as same rules apply.
Phone Locality: Connected via the Internet (STUN)
In this setup the phone will make use of RPS provisioning given the bare minimum firmware (as defined in the main provisioning guides) is installed and the phone is in factory default!
Phone Locality: Connected via a 3CX SBC
In this setup the SBC acts as multicast forwarder to the 3CX and enables the provisioning via P’n’P method for all the remote phones behind this SBC.