Vibrant enterprise VoIP has developed rapidly, the application form, tend to be diversified, VoWLAN works have two kinds, one kind of circumstance is to call transfer to WLANAP VoWLAN telephone terminal, and then through a VoIP gateway implementation with the exchange of original PBX based on circuit switching, and through the PBX with PSTN communication; Another case is VoWLAN telephone terminal connected with IPPBX, directly by the AP by IPPBX and PSTN exchange, if VoWLAN system directly connected to the VoIP phone provider, you can directly dial IP phone, realize to PSTN fall to the ground,
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