Differences between the AG and PBX

The differences between the access gateway (AG) and PBX are as follows:
- A PBX can function as the switching layer device of the private network and provides address positioning and other services for voice users. It can also connect private network users to the IMS or PSTN through trunks such as SIP trunks.
- An AG refers to a media access gateway. Compared with the PBX, the AG can only connect private network users to the IMS or PSTN through trunks such as SIP trunks.
- The SIP AG is based on SIP.
- The H248 AG is based on H248.

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