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

[Stephen James]

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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