[SIPForum-discussion] issue of the VoIP for the point-of-sale terminals

[Saurabh Shah]

Hi Joey, 


You can use late media. This will restrict party B to send RTP because it do not have connection details of gateway. 


Regards, 
Saurabh Shah 

----- Original Message -----

From: "murat buker" <murat_buker at yahoo.com> 
To: "Stephen James" <sjames_1958 at yahoo.com>, "Joey ZHENG" <joey.zheng at sagemcom.com> 
Cc: discussion at sipforum.org 
Sent: Wednesday, January 23, 2013 5:17:04 AM 
Subject: Re: [SIPForum-discussion] issue of the VoIP for the point-of-sale terminals 


Hi James, 

Early media means early SDP handsakes. In Joey's case, there is no SDP handshake, so gateway can't prepare itself ( because gateway does'nt know codec etc.., it can't allocate it's dsp resource). Please highlight RFC statements that cover your opinion, and let me correct myself. 

Murat Buker 








From: Stephen James <sjames_1958 at yahoo.com> 
To: Joey ZHENG <joey.zheng at sagemcom.com> 
Cc: "discussion at sipforum.org" <discussion at sipforum.org> 
Sent: Tuesday, January 22, 2013 10:20 PM 
Subject: Re: [SIPForum-discussion] issue of the VoIP for the point-of-sale terminals 




Once the gateway has sent it should be prepared to receive RTP per RFC 3261 or 3262. There may be a gateway setting to enable early media. 

Sent from my iPhone 

On Jan 21, 2013, at 21:48, Joey ZHENG < joey.zheng at sagemcom.com > wrote: 





Hi All, 

Now we got a problem: 
The test setup: 
POS payment terminal----->Gateway<---------->Internet<---->party B 
Once B received the invite, it will send the RTP packets immediately to Gateway. 
And it cause the problem that: 
Gateway didn't receive the SDP in 200 or 180 to know the RTP information, then early RTP packets to the gateway are dropped, not transferred to the POS terminal. 
But there are some handshake signal in these early RTP packets, like 2100Hz CED. And since POS didn't receive the CED signal, the handshake between POS terminal and the party B always failed. 

Is there anyone who got the same problem, and what's the best solution for this? Is there any way to notify the party B to delay the RTP stream by the SIP message? 

BRS, 

Joey 
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