Find a cloud based VOIPPBX out there that is commercially supported that provides dial tone.
找到一个基于云的网络电话路由器,该设备还提供拨号音。
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I've been looking around for a "commercially supported cloud-based VOIPPBX that provides dial tone" for the past few weeks and I keep coming up empty on the SIP phones.
The typical IP PBX can also switch calls between a VoIP user and a traditional telephone user, or between two traditional telephone users in the same way that a conventional PBX does.