1ISDN_P_BASE		0
2ISDN_P_TE_S0		1
3ISDN_P_NT_S0		2
4ISDN_P_TE_E1		3
5ISDN_P_NT_E1		4
6ISDN_P_LAPD_TE		0x10
7ISDN_P_LAPD_NT		0x11
8ISDN_P_B_RAW		0x21
9ISDN_P_B_HDLC		0x22
10ISDN_P_B_X75SLP		0x23
11ISDN_P_B_L2DTMF		0x24
12ISDN_P_B_L2DSP		0x25
13ISDN_P_B_L2DSPHDLC	0x26
14/*
15 * those two are present in include/linux/mISDNif.h but are not handled during
16 * socket creation.
17 */
18/* ISDN_P_B_T30_FAX	0x27 */
19/* ISDN_P_B_MODEM_ASYNC	0x28 */
20