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    SIP response codes – Difference between ‘603 Decline’ and ‘486 Busy Here’

SIP response codes – Difference between ‘603 Decline’ and ‘486 Busy Here’

While lecturing on SIP response codes, I’ve had several students ask for an explanation of the case usage for a ‘603 Decline’ and a ‘486 Busy Here’.

The short answer is that all 6xx responses will terminate SIP dialog, and any pending searches. Alternatively, a 486 response would indicate that the user is not available at a particular request-URI.

I have constructed a video that demonstrates the difference between these two responses. It might even answer a few questions you didn’t even know you had.

Examining the 486 ‘Busy Here’ and 603 ‘Decline’ SIP response codes

SIP Downloads *.pcap
This video mentions two accompanying […]

By |October 17th, 2014|Blog, Video|4 Comments
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Teaching SIP Essentials (onsite & online)

I am an instructor for SIP Essentials, a five day course offered by Alta3 Research that explores Session Initiation Protocol (RFC 3261), as well as it’s accompanying protocols. Material covered is outlined on their website, but covers SIP, SIP dial-plan routing, SIP routing via the DNS, configuring SIP systems, presence, how to read SIP requests & SIP responses, SDP, RTP, and so much more… (no really, I’m not just being cliché, read the extensive course outline here).

As a teacher, I must say, teaching SIP Essentials is a blast. The course includes over 30 labs, so there’s plenty of hands on activities in between my lecturing. The […]

By |October 29th, 2012|Projects|0 Comments
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A basic Asterisk v1.8 sip.conf configuration

One of the many goals I set for the students attending my Session Initiation Protocol class, is to leave them with an ability to maintain their own home Asterisk SIP PBX. After all, if you don’t exercise a muscle, it will atrophy; your SIP muscle is no different. It is only by rolling up your shirt sleeves, and diving into the fray, that you can really begin fully understand SIP (and those protocols it is accompanied by… SDP, RTP, DNS, etc).

So, my hope is that this post can take some of the mystery and apprehension out of the initial […]

By |October 29th, 2012|Blog|1 Comment
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SIPNOC 2012 – June 25th – 27th @ Hyatt in Dulles, VA

The sipforum.org opened SIPNOC US2012 for registration on November 14th. The event takes place June 25th – 27th at the Hyatt in Dulles, VA (west of Washington DC) and is geared at operational staff, architects and engineers whom employ the use of SIP on a daily basis. The central location is ideal for professionals traveling from all parts of North America and Europe.

I’ve never been to a SIPNOC event, but the photo in this post is taken from SIPNOC 2011; appears to have a decent turnout. From what I can gather at the SIPNOC 2012 event website, you can either come and […]

By |November 20th, 2011|Blog|3 Comments
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Watch out Cisco, here comes Avaya!

Today, while taking a break from playing with some gear in the Alta3 Research labs, I found an interesting article while running a search on ‘SIP’ in GoogleNews. Not-so-surprisingly, Avaya’s name popped up in several headlines. As I just finished helping write Alta3 Research’s course on Avaya SIP Trunking, I thought this might be an opportune time to comment on why Avaya and SIP are becoming so intimately entwined.

Avaya recently made a press statement at the U.S./Gov Sales Leadership and Partner Conference, reminding the public that they have released 60+ products in less than two years- more than Avaya had […]

By |November 18th, 2011|Blog|0 Comments
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First Post of The Website, More To Come

Welcome web traveler! I am Zach Feeser, and this is my glorious webpage. From it, I hope will flow all of the secrets of mind I was previously giving ever so haphazardly to social media outlets, such as Facebook. My interests, projects and thoughts can all be found by reading my blog, or by clicking around my site. Basically, if you’re looking to be my stalker, or are currently stalking, you’ve come to the right place. You’re one stop shop for all unfiltered Zach Feeser all the time.

Stalker or not, feel free to follow me on Twitter, LinkedIn or […]

By |October 23rd, 2011|Blog|0 Comments
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