The UMG8900 supports the signaling adaptation and transfer from the TDM mode to the IP
packet mode based on the standard SIGTRAN protocol as per below Service processing capability (signaling transfer):

Item		Index
MTP2 links	64 kbit/s	128 links per board, up to1024 links
	2 Mbit/s	4 links per board, up to144 links
MTP3 links	64 kbit/s	128 links per board, up to1024 links
	2 Mbit/s	4 links per board, up to144 links
Q.921 links	64 kbit/s	252 links per board, up to1024 links

For which purpose, Q.921 links are used?

MTP2 links & MTP3 links capacity are same. Is it right?

Excellent protocol analysis

Very useful info

useful document, thanks