Numeric Enumeration: 0-5 (0=NONE, 1=I_CSCF, 2=S_CSCF, 3=P_CSCF, 4=ISP, 5=IS)
0
NONE
1
I_CSCF
2
S_CSCF
3
P_CSCF
4
ISP
5
IS