Archive for category VOIP

SEP.cnf.xml for a Cisco 7975G with chan-sccp-b

This is an annotated/censored copy of the SEPxxx.cnf.xml I use with my 7975G and chan-sccp-b/asterisk.

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AppleScript desktop dialer for Asterisk

Asterisk Desktop Dialer

This is an incredibly simple idea – but incredibly useful: a desktop application (written in applescript) where you copy/paste the number you wish to dial, it connects to your local asterisk server via its management interface, and dials the number on your phone.

You’ll need a mac (obviously), a desktop phone (even more obviously), and an asterisk server (most obviously), preferably on your lan, which you can configure to allow network access to the AMI (Asterisk Manager Interface).
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What the f&*k’s up with IM Video on Linux

I mean how difficult can it be?

  • Skype: It’s the best I’ve found so far, but it still sucks dried donkey turds. Aside from minor annoyances like having to run the static build coz the buttons keep disappearing otherwise, random crashes for no apparent reason, dropped calls every time it tries to switch to TCP (helloooooo? TCP for realtime video is a terrible idea!) and generally bombing out for an indefinite period after about 10 minutes of conversation … where was I? … oh yes: Well skype is evil, isn’t it? Proprietary, closed-source, linux-is-an-afterthought and all that. Bah.
  • Pidgin: Well the great god ubuntu gives it his stamp of approval. But, well, did they forget to put in audio/video? Oh wait, a little googling tells me that they don’t actually care about audio/video conferencing. They may implement it, some day. But that day isn’t now.
  • Kopete: Aside from being ugly, and coming with a shedload of kde stuff I don’t want; video is limited to MSN and Yahoo. Hmm … well that’s useful eh? Don’t know (or more correctly, wish to speak to) anyone who uses either.
  • Ekiga: An hour or so tweaking around with an asterisk server to set up video, and twenty minutes convincing the other end of the call (a windows user) that they wish to install Ekiga, led to a 2 minute call with terrible video and no audio, and downed internet connections on both ends for about 20 minutes afterwards (I’m guessing that ekiga was trying to send video info so fast that it just stacked up at both routers, and killed everything else). This one nearly cost me a divorce.
  • Wengo: Signup on their site is broken – no problem I says, I’ll use asterisk again. Turns out their implementation of H263 is non-standard and doesn’t work with asterisk. Great.

Is that it? Are my options exhausted? I think so.

So for now it’s suffer skype, or run windows in a vm.

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SIP TCP support in Asterisk

Edit: This post is now quite out of date. There’s a more recent discussion of this at the trixbox forums.

Original Post:
Despite digium‘s screwed up licensing restrictions, and its diabolical coding standards (something which Callweaver will hopefully make a thing of the past, but that’s for another day), SIP over TCP support is now finally available in asterisk (at least for the 1.2 branch).

Brief instructions how to upgrade your 1.2.x installation are given below: Read the rest of this entry »

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Nokia E65 supported codecs

Based on a little sip debugging, these appear to be the supported audio codecs on the Nokia E65

  • AMR
  • PCMU
  • PCMA
  • iLBC
  • G729

The above is the order they’re presented in, so it’s probably also the order of preference.

Note: These are for VOIP calls only, the media player supports a much broader range of formats.

Update (15 Oct 2007): Nokia have released a simple application called SIP VOIP Settings which now allows you to change the preference order of codecs.

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Nokia SIP settings for Irish VOIP providers

Well it took me long enough to work out what works, so here they are in case someone else finds them useful. Read the rest of this entry »

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