Install this version:
emerge -a =dev-perl/Cisco-IPPhone-0.50.0
If this version is masked, you can unmask it using the autounmask tool or standard emerge options:
autounmask =dev-perl/Cisco-IPPhone-0.50.0
Or alternatively:
emerge --autounmask-write -a =dev-perl/Cisco-IPPhone-0.50.0
# Copyright 1999-2021 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2
EAPI=8
DIST_AUTHOR=MRPALMER
DIST_VERSION=0.05
DIST_EXAMPLES=("examples/*")
inherit perl-module
DESCRIPTION="Cisco IP Phone interface using XML Objects"
LICENSE="Artistic"
SLOT="0"
KEYWORDS="~amd64 ~x86"