PRI/QSIG vs SIP trunk

[phadobas]

I'm trying to decide how to interconnect an SV9300 with a Cisco Call Manager in order to enable station-to-station calls at a location. There is no PRI port on either phone systems right now, and there are no SIP trunk licenses on the SV9300. So I can go both ways.

Are there any functions that would decide whether I should do an ISDN PRI between the two systems, or SIP trunk?

I assume, basic features like station number display would work on both. Any other features that may or may not work on one or the other type of link between the two?

 

[belevedere]

PRI is a good choice, but features are somewhat limited.
QSIG gives you some additional features over PRI.
SIP trunks are probably the most feature rich, but they will require more network involvement and a PAD card and licensing.

 

[phadobas]

Great, thank you.