Router has analog ports to receive & make call to pstn. Some lines come in thru an EVM-HD-8FXS/DID that connect to a punch down block(110 block), while some individual lines connect to the VIC2-4FXO ports & directly to telco. Outbound calls work fine. Calls from pstn that come in thru the EVM-HD-8FXS/DID ring the IP phones but the caller gets a fast busy, while the called party will answer & hears dead air.
IP Phones-----Router(EVM-HD-8FXS)-----66/110 block-----telco
Why are the calls are failing?. Supposedly this was previously working.