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

[Joey ZHENG]

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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