DIDforSale is a Certified SIP Trunk Provider for ShoreTel PBX System. It’s a leading DID origination, DID Termination, Tollfree number provider with largest footprint in US, UK and Canada.
Configure GrandStream 502 ATA with DIDForSale SIP Trunking Service. You can get the phone number from anywhere in US and point it to your GS 502 ATA anywhere in the world. There is not extra charge for routing calls to your ata.