sip-audio-session, new libxml2

i’m using nagios to wake me up. not every day – only when there’s some outage. i have pair of nagios servers – one in Sweden, one in Poland – they cross-check one another and – for the most critical problems – send sms and make a phone call. for sms’es i’m using budgetsms.net, for the phone calls – some sip provider and command line tool sip-audio-session from the sip simple client sdk project. recently i got just sms but not a phone call. after a bit of digging it turned out that sip-audio-session no longer works.

running

sip-audio-session --auto-hangup 30 0046712112233@my.sip.provider

with config file ~/.sipclient/config:

Accounts:
    46112211777@my.operator.com:
        enabled = true
        auth:
            password = somePasswordForMySipAccount



SIPSimpleSettings:
    default_account = 46112211777@my.operator.com
    instance_id = "urn:uuid:11111111-2222-3333-4444-555555555555"
    audio:
        alert_device =
        input_device =
        output_device =

used to give me a 30 seconds long ‘missed call’ on my mobile – 0046712112233, but after the recent libxml2 upgrade gave me instead:

using set_wakeup_fd
Traceback (most recent call last):
  File "/usr/bin/sip-audio-session", line 24, in <module>
    from sipsimple.account import Account, AccountManager, BonjourAccount
  File "/usr/lib/python2.7/dist-packages/sipsimple/account/__init__.py", line 29, in <module>
    from sipsimple.account.xcap import XCAPManager
  File "/usr/lib/python2.7/dist-packages/sipsimple/account/xcap/__init__.py", line 39, in <module>
    from sipsimple.payloads import addressbook, commonpolicy, dialogrules, omapolicy, pidf, prescontent, presrules, resourcelists, rlsservices, xcapcaps, xcapdiff
  File "/usr/lib/python2.7/dist-packages/sipsimple/payloads/xcapdiff.py", line 23, in <module>
    XCAPDiffDocument.register_namespace(namespace, prefix=None, schema='xcapdiff.xsd')
  File "/usr/lib/python2.7/dist-packages/sipsimple/payloads/__init__.py", line 201, in register_namespace
    cls._update_schema()
  File "/usr/lib/python2.7/dist-packages/sipsimple/payloads/__init__.py", line 134, in _update_schema
    cls.schema = etree.XMLSchema(etree.XML(schema))
  File "xmlschema.pxi", line 105, in lxml.etree.XMLSchema.__init__ (src/lxml/lxml.etree.c:132605)
lxml.etree.XMLSchemaParseError: Detected an entity reference loop, line 30, column 38

after some googling i’ve found this bug report: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=767877

so for now i had to revert back to the older [and vulnerable] libxml2_2.8.0+dfsg1-7+wheezy1_i386.deb available eg from ftp://ftp.pl.debian.org/pub/debian/pool/main/libx/libxml2/ . to avoid unexpected updates i’ve pinned that package version by creating /etc/apt/preferences.d/libxml2 with:

Package: libxml2
Pin: version 2.8.0+dfsg1-7+wheezy1
Pin-Priority: 999

hopefully in a while the underlying problem will be resolved too. i’m setting a reminder few months from now to check if pinning can be removed.

2015-07-19

above served me well but at some point also stopped working. so i’ve turned into linphone for my nagios notifications via a missed calls:

my ~/.linphonerc:

[sip]
verify_server_certs=1
verify_server_cn=1
contact=sip:toto@unknown-host
media_encryption=none
default_proxy=0
multi_transport_migration_done=1
guess_hostname=1
inc_timeout=30
in_call_timeout=0
delayed_timeout=4
use_ipv6=0
register_only_when_network_is_up=1
register_only_when_upnp_is_ok=1
use_info=0
use_rfc2833=0

[net]
download_bw=0
upload_bw=0
mtu=1300
firewall_policy=0

[auth_info_0]
username=4xxxxxxxx31
passwd=somepassword
domain=sip.operator.com

[rtp]
audio_rtp_port=7078
video_rtp_port=9078
audio_jitt_comp=60
video_jitt_comp=60
nortp_timeout=30
audio_adaptive_jitt_comp_enabled=1
video_adaptive_jitt_comp_enabled=1



[proxy_0]
reg_proxy=sip:sip.operator.com
reg_route=sip:sip.operator.com
reg_identity=sip:4xxxxxxxx31@sip.operator.com
reg_expires=3600
reg_sendregister=1
publish=0
dial_escape_plus=0

and the calling script:

timeout -s 9 15 bash -c "(sleep 3; echo call 004673xxxxxxx@sip.operator.com; sleep 20 ) | linphonec"

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