--- asterisk.orig	2016-09-25 21:48:47.000000000 +0200
+++ asterisk	2016-09-25 22:05:03.000000000 +0200
@@ -53,14 +53,19 @@
 
 	if [ -n "${ASTERISK_USER}" ]; then
 		ast_user="${ASTERISK_USER%%:*}"
-		ast_group="${ASTERISK_USER#*:}"
-		ast_group="${ast_group%%:*}"
+		if [[ "${ASTERISK_USER}" = *:* ]]; then
+			ast_group="${ASTERISK_USER#*:}"
+			ast_group="${ast_group%%:*}"
+		else
+			ast_group=""
+		fi
+
 		[ -z "${ast_user}" ] && ast_user=root
-		[ -z "${ast_group}" ] && ast_group="$(getent group $(getent passwd "${ast_user}" | awk -F: '{ print $4 }') | sed -re 's/:.*//')"
+		[ -n "${ast_group}" ] && ast_prim_group="${ast_group}" || ast_prim_group="$(getent group $(getent passwd "${ast_user}" | awk -F: '{ print $4 }') | sed -re 's/:.*//')"
 	fi
 
 	[ -z "${ast_user}" ] && ast_user=root
-	[ -z "${ast_group}" ] && ast_group=root
+	[ -z "${ast_prim_group}" ] && ast_prim_group=root
 
 	return 0
 }
@@ -69,7 +74,7 @@
 	setup_svc_variables
 
 	local path
-	checkpath -d -m 0755 -o ${ast_user}:${ast_group} "${ast_logdir}" "${ast_rundir}" "${ast_spooldir}"
+	checkpath -d -m 0755 -o ${ast_user}:${ast_prim_group} "${ast_logdir}" "${ast_rundir}" "${ast_spooldir}"
 	for path in "${ast_rundir}" "${ast_spooldir}" "${ast_logdir}"; do
 		ebegin "Checking ${path}"
 		find "${path}" ! -user "${ast_user}" | while read element; do
@@ -186,7 +191,7 @@
 		if [ -n "${ASTERISK_CORE_DIR}" ] && \
 		   [ ! -d "${ASTERISK_CORE_DIR}" ]
 		then
-			checkpath -d -m 0755 -o ${ast_user}:${ast_group} "${ASTERISK_CORE_DIR}"
+			checkpath -d -m 0755 -o ${ast_user}:${ast_prim_group} "${ASTERISK_CORE_DIR}"
 		fi
 		ASTERISK_CORE_DIR="${ASTERISK_CORE_DIR:-/tmp}"
 
@@ -248,20 +253,20 @@
 	fi
 	OPTS="${OPTS} -U ${ast_user}"
 
-	if ! getent group "${ast_group}" &>/dev/null; then
-		eerror "Requested to run asterisk with group ${ast_group}, which doesn't exist."
+	if ! getent group "${ast_prim_group}" &>/dev/null; then
+		eerror "Requested to run asterisk with group ${ast_prim_group}, which doesn't exist."
 		return 1
 	fi
-	OPTS="${OPTS} -G ${ast_group}"
+	[ -n "${ast_group}" ] && OPTS="${OPTS} -G ${ast_group}"
 	
 	if [ "${ast_user}" = root ]; then
 		ewarn "Starting asterisk as root is not recommended (SERIOUS SECURITY CONSIDERATIONS)."
-	elif [ "${ast_group}" = root ]; then
+	elif [ "${ast_prim_group}" = root ]; then
 		ewarn "Starting asterisk with group root is not recommended (SERIOUS SECURITY CONSIDERATIONS)."
 	fi
 
-	checkpath -d -m 0755 -o "${ast_user}:${ast_group}" "${ast_logdir}" "${ast_rundir}"
-	einfo "Starting asterisk as      : ${ast_user}:${ast_group}"
+	checkpath -d -m 0755 -o "${ast_user}:${ast_prim_group}" "${ast_logdir}" "${ast_rundir}"
+	einfo "Starting asterisk as      : ${ast_user}:${ast_group:-${ast_prim_group} (+supplementaries)}"
 	asterisk_run_loop ${OPTS} 2>&1 | logger -t "wrapper:${ast_instancename}" &
 	result=$?