Voice of VOIPSA » Nikos Simantirakis http://voipsa.org/blog Collective thoughts and musings on the state of VoIP security today. Tue, 07 Sep 2010 18:22:50 +0000 en hourly 1 http://wordpress.org/?v=3.0.1 Asterisk Tag 2008 in Berlin http://voipsa.org/blog/2008/05/22/asterisk-tag-2008-in-berlin/ http://voipsa.org/blog/2008/05/22/asterisk-tag-2008-in-berlin/#comments Thu, 22 May 2008 09:14:38 +0000 Nikos Simantirakis http://voipsa.org/blog/?p=375 The German Asterisk Tag (Asterisk Day) takes place in Berlin 26-27th May, 2008. Some of the presentations will cover security issues as well as issues companies are facing when introducing VoIP. Among the speakers are Mark Spencer (Digium) and Phil Zimmermann, the latter one talking about Zfone.

]]> http://voipsa.org/blog/2008/05/22/asterisk-tag-2008-in-berlin/feed/ 0 Buffer Overflow discovered in sipXtapi http://voipsa.org/blog/2006/07/10/buffer-overflow-discovered-in-sipxtapi/ http://voipsa.org/blog/2006/07/10/buffer-overflow-discovered-in-sipxtapi/#comments Mon, 10 Jul 2006 13:56:58 +0000 Nikos Simantirakis http://voipsa.org/blog/2006/07/10/buffer-overflow-discovered-in-sipxtapi/ Michael Thumann has revealed a buffer overflaw in the SIP Foundry’s sipXtapi code (used among others in AOL Triton). The flaw occurs when parsing the CSeq field and permits executing arbitrary code. You can read the report at Neohapsis Archives.

]]> http://voipsa.org/blog/2006/07/10/buffer-overflow-discovered-in-sipxtapi/feed/ 0 VoWLAN with Smartphones http://voipsa.org/blog/2006/06/27/vowlan-with-smartphones/ http://voipsa.org/blog/2006/06/27/vowlan-with-smartphones/#comments Tue, 27 Jun 2006 17:54:21 +0000 Nikos Simantirakis http://voipsa.org/blog/2006/06/27/vowlan-with-smartphones/ The German mobile telephony reseller eteleon has presented a new offering for a VoWLAN bundle featuring the Nokia E60, E61 and E70 smartphones with WLAN and VoIP capabilities. The offering is for use both in the GSM network as well as with Hotspots (or simply with the WLAN at home or in the office). Roaming from WLAN to GSM during a call is nevertheless not an option before the arrival of UMA (Unlicensed Mobile Access). The SIP clients of the Nokia models are delivered preconfigured for use with the VoIP service of the dus.net provider. The interesting thing about it: dus.net is already offering free SRTP encryption as part of its VoIP service. Though the Nokia SIP client doesn’t seem to support it, this is only a small step towards secure mobile VoIP. Should someone tell them?

You can find out more at heise and eteleon (both in German).

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