[SIPForum-discussion] multiple SIP INFO

Jesie Paluca jesie.paluca at gmail.com
Thu Jul 21 18:32:51 UTC 2011

Hi Vijay

Info method is used for communicating mid-session signaling information
along the signaling path for the call.  As such once DTMF is received by MGC
from PSTN, MGC will transmit INFO request immediately on the SIP leg on an
interval timing.

DTMF on a single call session is transmitted one at time thereby no such
cases wherein MGC can received multiple DTMF at the same time on an
established or connected session.

Although there are high possibilities that multiple DTMF will be receive at
similar time on the receiving MGC but it would be on separate media path or
session.  Each call session has different media path or channel.

Hope this help.



It was not mentioned on the RFC on how SIP INFO is transmitted over the
signaling path.

On Thu, Jul 21, 2011 at 8:45 AM, vijay baskar <vijaybaskar.sm at gmail.com>wrote:

> Hi Forum,
> A question on the SIP INFO method.
> Is it possible to send multiple SIP INFO at the same time, without waiting
> for the 200 OK response for the previous SIP INFO.

> Requirement is if there is multiple dtmf digits received at the same time
> from the PSTN, then the MGC has to send all the dtmf digits at the same time
> to the IP side using SIP INFO, instead of sending 1 SIP INFO and waiting for
> the 200OK for this, and then continue with the 2nd SIP INFO.
> Thanks in advance.
> BRs
> Vijay
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