FROM docker.io/library/alpine:3.24

# Asterisk 22 (the LTS branch), PJSIP included: Alpine bundles pjproject in the
# main package. dnsmasq serves the provisioning files of the phones over TFTP,
# and the httpd of busybox-extras their directory over HTTP, from the same
# image, so that a single build keeps all three up to date.
RUN apk add --no-cache asterisk dnsmasq busybox-extras

# busybox httpd sends no Content-Type for .xml files without this line, and
# the XML services of the phones expect text/xml.
RUN printf '.xml:text/xml; charset=utf-8\n' > /etc/httpd.conf

# /etc/asterisk is empty: the sample files are in asterisk-sample-config, which
# is not installed. The configuration is mounted read-only there at run time.

# SIP signalling. RTP uses 10000-10999/udp, as set in rtp.conf.
EXPOSE 5060/udp

ENTRYPOINT [ "/usr/sbin/asterisk" ]
CMD [ "-f", "-n", "-vv" ]