diff --git a/configs/zapata.conf.sample b/configs/zapata.conf.sample
index 49cea6b5347e326639d17da5672e1acd1b35c645..979e061157511e42d81704106cdc7179eb68f7f9 100755
--- a/configs/zapata.conf.sample
+++ b/configs/zapata.conf.sample
@@ -24,15 +24,17 @@ context=default
 switchtype=national
 ;
 ; Signalling method (default is fxs).  Valid values:
-; em:     E & M
-; em_w:   E & M Wink
-; featd:  Feature Group D (The fake, Adtran style)
-; fxs_ls: FXS (Loop Start)
-; fxs_gs: FXS (Ground Start)
-; fxs_ks: FXS (Kewl Start)
-; fxo_ls: FXO (Loop Start)
-; fxo_gs: FXO (Ground Start)
-; fxo_ks: FXO (Kewl Start)
+; em:      E & M
+; em_w:    E & M Wink
+; featd:   Feature Group D (The fake, Adtran style, DTMF)
+; featdmf: Feature Group D (The real thing, MF (domestic, US))
+; featb:   Feature Group B (MF (domestic, US))
+; fxs_ls:  FXS (Loop Start)
+; fxs_gs:  FXS (Ground Start)
+; fxs_ks:  FXS (Kewl Start)
+; fxo_ls:  FXO (Loop Start)
+; fxo_gs:  FXO (Ground Start)
+; fxo_ks:  FXO (Kewl Start)
 ; pri_cpe: PRI signalling, CPE side
 ; pri_net: PRI signalling, Network side
 ;
@@ -127,6 +129,26 @@ immediate=no
 ;
 ;adsi=yes
 ;
+; Select which class of music to use for music on hold.  If not specified
+; then the default will be used.
+;
+;musiconhold=default
+;
+; PRI channels can have an idle extension and a minunused number.  So long
+; as at least "minunused" channels are idle, chan_zap will try to call
+; "idledial" on them, and then dump them into the PBX in the "idleext"
+; extension (which is of the form exten@context).  When channels are needed
+; the "idle" calls are disconnected (so long as there are at least "minidle"
+; calls still running, of course) to make more channels available.  The
+; primary use of this is to create a dynamic service, where idle channels
+; are bundled through multilink PPP, thus more efficiently utilizing
+; combined voice/data services than conventional fixed mappings/muxings.
+;
+;idledial=6999
+;idleext=6999@dialout
+;minunused=2
+;minidle=1
+;
 ; Each channel consists of the channel number or range.  It
 ; inherits the parameters that were specified above its declaration
 ;