[asterisk-users] Re: Question about DSP in Digium card

[Brad Sumrall]

Whether it is IAX, SIP, H323 or ?????

 

These are authentication handshakes to establish an rtp stream.

 

SIP = user name and password in a standardized IP packet

IAX = same

H.323 = same

 

Is also has to do with what codec are supported as well.

 

As far as NAT is concerned!

 

Yep, tell your ISP to forward the authentication port or just junk their
gear and get something like a low end Cisco.

 

Or

 

Get IP Phones with STUN (a little pricey)

 

Or

 

Trick!!!!

 

Use some type of tunneling gear to an outside IP (outside your NAT) and then
bounce your authentication from this new gateway!!!

i.e. establish a VPN connection to an outside router from an internal router
and drive the call through there.

 

Brad

 

  _____  

From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of A. Levy
Sent: Tuesday, March 27, 2007 6:54 AM
To: asterisk-users at lists.digium.com
Subject: [asterisk-users] Re: Question about DSP in Digium card

 

well, ...,we did not choose SIP because our customers are located behind NAT
router (using private IP's) and those routers
are not managed by them but by the ISP so it is very difficult to establish
full duplex phone calls because 
you can not initiate voice over ip session from the internet (outside) to
LAN side (inside) with private IP's. We could not establish 
2-way phone calls, I mean, the conversation is listened in 1-way only. As I
mentioned before, we can not configure PAT into the NAT router neither 
because is handled by the ISP and the passwords are unknown ....
That's  why we decided to use IAX instead of SIP, I mean, IAX is more robust
than SIP when the NAT router is 3th-party managed and
the PAT feature is not enable. 
On the other and we tested IAX over dialup links and it worked fine....
Those are the reasons we choose IAX as "acess protocol" to our SIP/H323
Network. You know, the access networks of the customers are different
completely: Private IP Address over DSL lines (NAT Router), Public IP
Address over DSL lines, Corporate Networks over dedicated Links (Public 
and IP Addresses), Dialup links, ...... 
Any comment would be welcomed,
thanks a lot

Levy.-

2007/3/24, A. Levy <ardielle at gmail.com>: 

Hello.

 

I have a TE405P Digium Card (4 E1's) with ISDN protocol and I need to find
out if there is any limitation about DSP capabilities, I mean, I am not sure
how many phone calls my Digium card supports, simultaneously. The calling
flow goes from IAX <-> ISDN. 
 

I am running this card into CPU like this:

- Micro PIV 3.0 

- 1Gbyte Memory

 

 

Thanks.

 

Levy.-
 

 

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