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

[murat buker]

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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