diff --git a/conf.d/ysigchan.conf.sample b/conf.d/ysigchan.conf.sample
index d0e82495..53d2460d 100644
--- a/conf.d/ysigchan.conf.sample
+++ b/conf.d/ysigchan.conf.sample
@@ -67,6 +67,9 @@
 ; Defaults to the trunk name if missing
 ;voice=
 
+; offset: int: Offset of voice circuit codes relative to low level circuit number
+;offset=0
+
 ; number: string: Prefix of numbers we accept call setups for, empty to accept all
 ; Only used by isdn-pri-cpe, makes sense when NET side is Point-to-Multipoint
 ; Setups are ignored if called number is present but doesn't start with this prefix
@@ -261,6 +264,9 @@
 ; Defaults to the trunk name if missing
 ;voice=
 
+; offset: int: Offset of voice circuit codes relative to low level circuit number
+;offset=0
+
 ; strategy: string: The strategy used to allocate voice channels for outgoing calls
 ; Allowed values:
 ;  - increment  Incremental search an idle channel starting with the last allocated channel
diff --git a/modules/server/ysigchan.cpp b/modules/server/ysigchan.cpp
index 5e23d894..dcef644c 100644
--- a/modules/server/ysigchan.cpp
+++ b/modules/server/ysigchan.cpp
@@ -2325,9 +2325,9 @@ SignallingCircuitGroup* SigTrunk::buildCircuits(NamedList& params, const String&
 	error = "Missing or invalid voice parameter";
 	return 0;
     }
+    unsigned int start = params.getIntValue("offset",0);
     SignallingCircuitGroup* group =
 	new SignallingCircuitGroup(0,SignallingCircuitGroup::Increment,debugName);
-    unsigned int start = 0;
     for (ObjList* o = voice->skipNull(); o; o = o->skipNext()) {
 	String* s = static_cast<String*>(o->get());
 	if (s->null())