Subject: RE: [Sigtran] doubts

From: "McCandless, Kevin" <[email-masked]>
Date: Wed, 10 Dec 2003 14:25:06 -0800

comments in line

-----Original Message-----
From: manish rathi [mailto:[email-masked]] 
Sent: Wednesday, December 10, 2003 10:59 AM
To: McCandless, Kevin
Cc: 'manish rathi'; [email-masked]; [email-masked]
Subject: Re: [Sigtran] doubts

thanks. 
Pls tell me the best selling products of signalling gateway in market. 
[McCandless, Kevin]  I can tell you who's switch we buy in a private email and they have the lion share of the market for STPs. 
Is there any place where free code/api is available? 
[McCandless, Kevin] Not sure, you might send a separate email to the list just for this question. 
What are advantages & disadvantages of signalling gateway & media gateway in a single platform. 
[McCandless, Kevin] Less space and power requirements are tangible advantages. Disadvantages would be scalability and feature sets.

Manish 

"McCandless, Kevin" wrote: 

Manish:From a service providers perspective you would be best deploying M3UA for your A link connections, SSP (MG) to STP.  Main reason is that there is a lot of vendor support for this protocol in terms of test gear and surveillance equipment and the protocol supports all SS7 applications needed for ISUP and TCAP functions. Sincerely,Kevin... 

-----Original Message----- 
From: manish rathi [mailto:[email-masked] <mailto:[email-masked]> ] 
Sent: Wednesday, December 10, 2003 8:50 AM 
To: [email-masked]; [email-masked] 
Subject: Re: [Sigtran] doubts
hi brian, 
I m attaching a pdf of SIGTRAN by  spider software in which the below things mentioned. 
SUA doesn't seem to be a choice as my pstn connectivity can not have sccp layer. 
i suppose m2pa can be used of we keep mtp-3,m2pa at SG  and mtp3 & m2pa at MGC. 
Say an aim comes from pstn node in mtp-3 message, u send it in m2pa data to MGC. MGC take mtp-3 from m2ua packet. 
Then iam from mtp3 pkt. 

Isn't it twice processing my m2pa, mtp-3 layer at SG & MGC? 

While processing is less in case when we implement m2ua/m3ua on SG. 

i've read rfc 2719, m3ua, m2ua rfc already, 
Is there any rfc which guide me how to implement signalling gateway? 

What's the convention in using m3ua/m2ua by designer of signalling gateway to 
be used by VOIP network. 

thanks 
regards 
Manish 

"Brian F. G. Bidulock" wrote: 

manish, 

You still have M2PA and SUA as choices... 

manish rathi wrote:                                                                 (Wed, 10 Dec 2003 16:22:03) 
> 
>    hi, 
>    that's correct. 
>    My requirement is to use MGC in 3G network for pstn interworking. 
>    Not interested in ISDN(Q.931) interworking. 
> 
>    i  don't  know abt DUA or GR303UA. I hope that it'll not be for simple 
>    pstn connectivity. 
> 
>    Now i've 2 choices . 
> 
>    Use M2UA at SG & MTP3, M2UA at MGC 
>    Use M3UA at SG & MGC & MTP-3 at SG 
> 
>    I've read that choice depends on density of ss7 links 
> 
>    M2UA is used when 
>     There  is  a low density of SS7 links at a par-ticular physical point 
>    in the network (per-haps as low as one) 

Not really.  Density of links has little to do with it. 

>    There  are  a large number of physically seperate SG functions (due to 
>    the SS7 links   being physically located remotely from each other) 
>    The  SG  function is co-located with an MG (usually due to one or more 
>    of the previ-ous conditions) 

Not necessarily.  We use M2UA to distribute MTP3 inside a platform on a 
PCMIG 2.17 backplane with very high densities and concentrations... 

> 
>    In  this case, it makes sense to host MTP3 in the MGC. The SS7 address 
>    (the  pointcode)  of the sys-tem resides with MTP3. If each SG had its 
>    own  MTP3  layer,  a  large  number of pointcodes would be required to 
>    implement  a  (logically)  single  gateway.  This  particular  Sigtran 
>    configuration  is  likely to be common in European networks, where the 
>    SS7 signaling links share the physical medium with voice circuits. 

No.  M2UA has not point code assigned.  M3UA SG does not need to have a 
point code (its own) either.  There is no difference there... 

> 
>    Pls explain the above with some example. 

Please provide an example of how you jumped to such conclusions. 

--brian 

> 
>    thanks 
>    regards 
>    Manish 
> 
> 
> 
> 
> 
> 
> 
> 
> 
>    "Brian F. G. Bidulock" wrote: 
> 
>      manish, 
> 
>      Well, there is also: 
> 
>         4) SUA 
>         5) M2PA 
>         6) IUA 
>         7) DUA 
>         8) GR303UA 
>         ... 
> 
>      Which you use depends on what your needs are and implementation- 
>      and deployment- and operational-specific considerations.  In one 
>      situation one of these is more advantageous than another.  In 
>      another situation the reverse might be true.  That is the stuff 
>      of network engineering and is best left to those that are practiced 
>      at it. 
> 
>      See RFC 2719 for a high level view. 
> 
>      --brian 
> 
>      manish rathi 
>      wrote: 
>          (Wed, 10 Dec 2003 14:25:52) 
>      > 
>      >    hi, 
>      >    to implement media gateway controller there are 2 options 
>      >    1) Use M3UA on signalling gateway 
>      >    2) Use of M2UA on signalling gateway 
>      > 
>      >    Tell me the advantages/disadvantages of each approach? 
>      > 
>      >    thanks 
>      >    regards 
>      >    Manish 
>      > -- 
>      > Things work out best for those who make the best use of it. 
> 
>      -- 
>      Brian F. G. Bidulock 
>      [email-masked] 
>      [1]http://www.openss7.org/ <http://www.openss7.org/>  
> 
> -- 
> Things work out best for those who make the best use of it. 
> 
> References 
> 
>    1. http://www.openss7.org/ <http://www.openss7.org/>  

-- 
Brian F. G. Bidulock 
[email-masked] 
http://www.openss7.org/ <http://www.openss7.org/> 

-- 

Things work out best for those who make the best use of it.

-- 

Things work out best for those who make the best use of it.