TIPS | Provisioning the Yealink T22P with CloudPBX

Here are a few tips to keep in mind when provisioning the Yealink T22P with CloudPBX:

- use firmware version 7.1+, as the configuration files make a lot more sense... a LOT more sense (blank example configuration files are attached to this)

- there is one 'common' file (which includes parameters you'd like applied to all phones), and MAC-specific files (which include parameters to be applied only to each specific phone).  This method is common across multiple hardware providers, because it makes good sense to do it this way.

- when specifying that the registration lookup be done as DNS-SRV, you MUST set the SIP ports to 0 for the lookup to actually be performed, otherwise the lookup will only execute an A-record query.

From the admin guide.. it's not obvious to figure this out, as the behaviour is different than before: "If a port is set to 0 and the transport type is set to DNS-NAPTR, NAPTR and SRV queries will be tried before falling back to A queries. If no port is found through the DNS query, 5060 will be used. If an explicit port (except 0) is specified and the transport type is set to DNS-NAPTR, the only lookup will be an A query"

Without setting the SIP ports to 0, the result is failed registration, since an A query doesn't work.