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

[HM Kias]

Hi,

I have encountered the same trouble on my PSTN gateway, but not on the ISDN
gw.


Regards,

Kias Hanifa

Fonicom



On Tue, Jan 22, 2013 at 9:18 AM, 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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-- 
HM Kias
91-9443467600
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