Comparison of SIP Trunk and IDA-P
|Types of communication supported
|TDM-based voice communication
|IP-based VoIP, unified communications brought about by IP PABX, such as instant messaging, presence, conference calls, video conferencing
|Scales up in multiple of 23 lines per step, resulting in wastage
|Maximum flexibility in dimensioning and usage of lines
|T1 / IDA cards requirement
|TDM-based PBX limited to 23 channels per trunk and requires purchase of costly T1/IDA-P card for trunk expansion
|Not required – a single interface can scale to up to 850 channels
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