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-rw-r--r--configs/chan_dahdi.conf.sample13
1 files changed, 12 insertions, 1 deletions
diff --git a/configs/chan_dahdi.conf.sample b/configs/chan_dahdi.conf.sample
index b7f59f795..841787c4c 100644
--- a/configs/chan_dahdi.conf.sample
+++ b/configs/chan_dahdi.conf.sample
@@ -258,7 +258,18 @@
; transfer feature of an analog phone.
; The default is no.
;hold_disconnect_transfer=yes
-;
+
+; BRI PTMP layer 2 persistence.
+; You should normally not need to set this option.
+; You may need to set this option if your telco brings layer 1 down when
+; the line is idle.
+; <blank>: Use libpri default.
+; keep_up: Bring layer 2 back up if peer takes it down.
+; leave_down: Leave layer 2 down if peer takes it down. (Libpri default)
+; (Layer 2 will be brought back up for an outgoing call.)
+;
+;layer2_persistence=leave_down
+
; PRI Out of band indications.
; Enable this to report Busy and Congestion on a PRI using out-of-band
; notification. Inband indication, as used by Asterisk doesn't seem to work