hi, All Dialogic needs to do is to provide a standard M3UA through SCTP ( or even TCP) - and if you do the same, regardless of vendor on Asterisk it should work - assuming both following the standard. But, to me it sounds like this is a very propritary solution ??? As for Asterisk I clearly remember a M3UA in LGPL some years ago, but I have not seen the code for it lately. But, you are GPL so you can canibilize from OpenSS7. If not I can provide source code in C for M2UA/M3UA in GPL compatible license assuming someone can assist on the Astrisk implementation. This is however work in progress, so it will take some time before it's ready. Jan Date: Mon, 8 Feb 2010 23:04:56 +0200 From: amish@xxxxxxxx To: asterisk-ss7 at lists.digium.com Subject: Re: How Asterisk + sigtran ? Hi John, Routing contexts and keys were discussed at length on the IETF's SIGTRAN mailing list, when M3UA was developed. You can look at the benefits of this approach in the mailing list archives. Anyway, would it not be possible for you to provide a M3UA implementation for Asterisk (even if it is in binary format to protect your proprietary code)? This would have the advantage of not requiring us to maintain an additional Diastar server (a potential point of failure). With the Diastar server, I would also need to purchase more Diastar servers as my capacity/redundancy requirements increase (in addition to increasing the asterisk capacity in the backend). M3UA would provide the benefit of multiple distributed asterisk boxes that can be added or removed on the fly from their connectivity to the signalling gateway. With M3UA we would also get the of from using SCTP in the distributed architecture, with its support for multi-homing, multiple streams, etc. features. With Diastar we use SIGTRAN over SCTP towards the PSTN. Do we not loose all the SCTP benefits by now using TCP from Diastar to Asterisk? As an example, SCTP reduces head-of-line blocking while using TCP from Diastar to Asterisk reintroduces head-on-line blocking. Best Regards, Amish On 02/08/2010 09:55 PM, John Hermanski wrote: Hi Amish, The main advantage of the client/server relation ship between the DiaStar server and the Asterisk client is to be able to provide a distributed system where it is possible to separate the signaling and network connections (DiaStar) from the application services. (Asterisk) This is an advantage for larger systems. Multiple standard, easily built Asterisk boxes can added or removed on the fly without any adjustments to DiaStar. There?s a clean separation between the application and network connectivity. While, as you point out, it may be possible to be more efficient by moving M3UA to the Asterisk systems, our base SS7 products (Dialogic Distributed Signaling Interface or DSI) do not allow this. The various SS7 components that make up SIGTRAN/ISUP operate as separate processes communicating by means of Unix message queues. They are controlled by a master process that reads the SS7 configuration and then starts up the needed stacks on the single system. DiaStar uses DSI, so we have to live within its constraints. So, rather than dividing work load based on routing contexts or keys, call distribution to multiple Asterisk systems is done by means of a ?who?s least busy and replies first? to the server?s request for someone to handle an inbound call. A ?Hello? message is sent from DiaStar, via Woomera, (the protocol used between Asterisk and DiaStar) to all Asterisk systems that have registered with the server. The Asterisk system who replies first (presumably the least busy system) will be granted the call. We think this is a reasonable way of call distribution. John Hermanski Technical Marketing Engineer Dialogic Inc. 5 Monroe St. Salem, MA USA Tel: 978 744 9098 Cell: 978 836 8028 Email: john.hermanski at dialogic.com Web: www.dialogic.com This e-mail is intended only for the named recipient(s) and may contain information that is privileged, confidential and/or exempt from disclosure under applicable law. No waiver of privilege, confidence or otherwise is intended by virtue of communication via the internet. Any unauthorized use, dissemination or copying is strictly prohibited. If you have received this e-mail in error, or are not named as a recipient, please immediately notify the sender and destroy all copies of this e-mail. _________________________________________________________________ Your E-mail and More On-the-Go. Get Windows Live Hotmail Free. https://signup.live.com/signup.aspx?id=60969 -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.digium.com/pipermail/asterisk-ss7/attachments/20100209/2e4585c2/attachment-0001.htm
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