The SHANG332 is because of having the FXO, so it can be used to connect VOIP with the PSTN .The SHANG33232 can provide the varieties, such as 8 FXOs,16 FXOs,24 FXOs and 32 FXO...etc. It can be used for the access method of the calling card service so that the calling card server connects into the PSTN.
2. configuration example
the IP telephone company, when they are lack of the digital E1/T1 connection, can use analogue line to provide termination to PSTN. For example the outside line has 8 lines, number is 82901131.
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