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|
|Scalability||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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