SIP Trunking 

VoIP phone system in Philippines also sometimes includes SIP Trunking which helps to enable the PBX of the endpoint to receive as well as making calls with the help of internet. This SIP is generally applied for the signaling protocol for the multiple real-time applications. Click here https://www.telnovo.net/services_sip_trunking/ for more information on SIP Trunking.