PROT_Q931_IE_LOW_LAYER_COMPAT 631 src/ftmod/ftmod_sangoma_isdn/ftmod_sangoma_isdn_trace.c case PROT_Q931_IE_LOW_LAYER_COMPAT: PROT_Q931_IE_LOW_LAYER_COMPAT 331 src/ftmod/ftmod_sangoma_isdn/ftmod_sangoma_isdn_trace.h {PROT_Q931_IE_LOW_LAYER_COMPAT, "Low-Layer Compatibility"},