Hi MadhuSri011,
Would you please tell us did you want to change the IP address with PSTN gateway?
If you want to change this IP address, you can open topology builder, choose PSTN Gateway, then you can define a new IP/PSTN gateway.
Here is a document for your reference
https://technet.microsoft.com/en-us/library/gg425945.aspx
https://technet.microsoft.com/en-us/library/dd572179(v=office.13).aspx
https://technet.microsoft.com/en-us/library/mt740655.aspx
According to my research, I couldn't find a powershell command to change the setting.
Hope the information is helpful to you.
Regards,
Alice Wang
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