|  | # | 
|  | # modularer ISDN driver | 
|  | # | 
|  |  | 
|  | menuconfig MISDN | 
|  | tristate "Modular ISDN driver" | 
|  | help | 
|  | Enable support for the modular ISDN driver. | 
|  |  | 
|  | if MISDN != n | 
|  |  | 
|  | config MISDN_DSP | 
|  | tristate "Digital Audio Processing of transparent data" | 
|  | depends on MISDN | 
|  | help | 
|  | Enable support for digital audio processing capability. | 
|  |  | 
|  | This module may be used for special applications that require | 
|  | cross connecting of bchannels, conferencing, dtmf decoding, | 
|  | echo cancellation, tone generation, and Blowfish encryption and | 
|  | decryption. It may use hardware features if available. | 
|  |  | 
|  | E.g. it is required for PBX4Linux. Go to http://isdn.eversberg.eu | 
|  | and get more information about this module and its usage. | 
|  |  | 
|  | If unsure, say 'N'. | 
|  |  | 
|  | config MISDN_L1OIP | 
|  | tristate "ISDN over IP tunnel" | 
|  | depends on MISDN | 
|  | help | 
|  | Enable support for ISDN over IP tunnel. | 
|  |  | 
|  | It features: | 
|  | - dynamic IP exchange, if one or both peers have dynamic IPs | 
|  | - BRI (S0) and PRI (S2M) interface | 
|  | - layer 1 control via network keepalive frames | 
|  | - direct tunneling of physical interface via IP | 
|  |  | 
|  | NOTE: This protocol is called 'Layer 1 over IP' and is not | 
|  | compatible with ISDNoIP (Agfeo) or TDMoIP. Protocol description is | 
|  | provided in the source code. | 
|  |  | 
|  | source "drivers/isdn/hardware/mISDN/Kconfig" | 
|  |  | 
|  | endif #MISDN |