Call routing with PSTN

[Bekzod Fakhriddinov]

Hi, sorry for this stupid question in advance, if  there is main office in NY with CUCM and CUBE -SIPto - PSTN and remote sites at for example Chicago, LA with their own DID , how or what is the better recommendation to route calls from :

1 call from NY PSTN to remote site office number via CUBE_SIP-internal network OR PSTN_NY-PSTN_Remotesite  (I'd prefer 2nd option cause would not load my sip trunks, but I may miss something)?

2 Call from Remote_ site_PSTN to NY office numbers? 

Thank you 

[Jaime Valencia · Accepted solution]

You usually only route internal calls over your WAN to avoid PSTN charges, however, if your WAN doesn't have enough BW, you can use locations + AAR to overflow to the PSTN, or completely route over the PSTN if you got a good deal and want to use the WAN for something else, that's really up to you.

[Bekzod Fakhriddinov]

yes, that i was thinking too , why should I care pstn calls, I mean calls made from pstn, but looks like this is how it was designed here and they don't want to change it. AT least I don't have so mu calls to remote sites. 

Thank you