I want to use a National DID in Thailand for incoming calls through the phone.systems PBX to SIP phone users in Thailand. What voice latency should I expect? More specifically, will the RTP traffic be routed between the PSTN gateway and the SIP phone users within the country, within the region (I see there’s a PoP in Singapore) or via Dublin / New York? The SIP phone software will support ICE.
due to nature and functionality of phone.systems, audio still would be processed inside it. Thus RTP will not be routed between softphone and PSTN gateway directly and there might be a latency.
Best would be to check it with DIDWW tech. support or request a test account to check the real audio and latency.