New Podcast: Samuel Rausch of Comcast: Engineering SIP Timers End-to-End for Optimal Network Performance

At the SIPNOC 2011 Conference held 2011 April 26-27 in Reston, Virginia, Samuel Rausch of Comcast spoke about their project tuning SIP Timers to improve failover performance in their network. They were able to successfully make network faults invisible by tuning the timers appropriately.

I sat down with Samuel during a break in the conference and recorded a short interview on his presentation.

You can listen to the interview by subscribing to the 200OK.info Podcast:

Advertisements

2 thoughts on “New Podcast: Samuel Rausch of Comcast: Engineering SIP Timers End-to-End for Optimal Network Performance

  1. as per de usual, another great blog entry! Great job Mark. Another thing worth mentioning is anyone using IMS has a much larger chore ahead of them in testing SIP timers in their infrastructure containing such a large number of sip entities. Additionally many providers are using SRV lookups for redundancy between sip proxies/SBC's . For this to be effective the lookup must be quick, or user's may reoriginate calls thinking they are not getting connected. This can cause even more calls to be sent to the failing/overloaded sip device. As described in RFC3263 the UA must try to communicate with the primary server for every new transaction and then fail over to the secondary. However, this will introduce very long call setup delays as RFC3261specifies a timeout of 32 seconds (timer B = 64 x T1). Therefore the handling of this and the behavior of the UA client side devices are critical to setting the proper SIP timers.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s