The gateway supports the four types of caller-ID extraction: - Bellcore/ETSI caller-id as described by Bellcore FSK 1200bps Caller-ID standards in SDMF or MDMF which is used in Australia, Canada, China, Hong Kong, New Zealand, Singapore and USA. The gateway expects to receive the caller-ID between the 1st and the 2nd ring for this caller-id variant. - British Telecom caller-id as described by BT SINs 227 and 242 which is used in UK. For this variant, The gateway expects to receive a polarity reversal followed by the caller-id before the first ring. The gateway extracts only the caller number from the caller-ID in SDMF mode and extract caller number and caller name in MDMF mode. - DTMF caller-id sent the 1st and the 2nd ring. - DTMF caller-id sent before the 1st ring and advertised by polarity reversal.

NOTE: Most traditional Telco operators offer the Caller-ID service as an optional feature. Make sure to enable this feature with your Telco operator if you need it.