In this case the IPT and IPM devices all increment by one in this case for that single virtual board. So if you have 16 ports license for both SIP (IP) and RTP (basic or enhanced) in your HMP license then it will go always follows:
iptB1T1 thru iptB1T16
ipmB1C1 thru ipmB1C16.
The only case where this will change is that if you initialize a second IP_VIRTBOARD structure which gets referenced thru gc_start() API and then you have two different virtual board on the IPT side of things. That is only time you might have a iptB2Tx in that case, but still ipm side will remain as ipmB1Cx etc.
Note having two licenses (bound to same NIC) is possible on single system, but only on linux release. It’s called the additive license feature noted in the SU release notes here. Refer to section 6.7:
www.dialogic.com/.../system_config_v5.pdf
Jeff