[asterisk-dev] chan_sip.c - no reply to critical packet

Gregory Boehnlein damin at nacs.net
Sat Jan 31 13:08:00 CST 2009

> > Remote-Party-ID: "pending"
> > <sip:4404530804 at>;party=calling;screen=yes;privacy=off
> >
> > The Info packet contains an update to the RPID line:
> >
> > Remote-Party-ID: "Cell Phone   OH"
> > <sip:>;party=called;screen=no;privacy=off
> >
> > So.. there has to be a way to have the Cisco wait to initiate the SIP
> > until the Q.931 data is received so that the  RPID is sent in the
> > invite....
> >
> > Anyone have any ideas?
> It's been a while since I worked on a cisco voice platform, but unless
> things have changed in the past few years I think the only way your
> going to get a delay is to use a TCL script.
> Before I sent off this message and show how out of the cisco voice game
> I am I did some googling to see if there was a better answer and found:
> http://blog.krisk.org/2007/07/whats-my-name.html
> Not sure exactly which part of the cisco config does the magic but its
> in there somewhere.

Right now, I am looking at the following settings:

timers buffer-invite 1024

I believe this is what I'm looking for, but I need some time and some call
traces to verify:


"Step 4 

timers buffer-invite timer

Router(config-sip-ua)# timers buffer-invite 500

Enables the SIP buffer-invite timer and sets the timer interval. The
argument is as follows:
.timer-Buffer-invite timer value, in ms. Range: 50 to 5000."

I'm currently using a value of 1024 ms or 1 second. I believe this will
prevent the Invite from being sent until 1 second after the Q.931 setup has
been received, and the subsequent receive of the "Information Update"

Jan 31 13:57:45: ISDN Se1/0:23 Q931: RX <- SETUP pd = 8  callref = 0x1809 
        Bearer Capability i = 0x8090A2 
                Standard = CCITT 
                Transfer Capability = Speech  
                Transfer Mode = Circuit 
                Transfer Rate = 64 kbit/s 
        Channel ID i = 0xA98387 
                Exclusive, Channel 7 
        Facility i = 0x9F8B0100A10F02017806072A8648CE1500040A0100 
                Protocol Profile =  Networking Extensions 
                Component = Invoke component 
                        Invoke Id = 120 
                        Operation = InformationFollowing (calling_name) 
        Progress Ind i = 0x8281 - Call not end-to-end ISDN, may have in-band
        Calling Party Number i = 0x2183, '8003952274' 
                Plan:ISDN, Type:National 
        Called Party Number i = 0xA1, '2169203099' 
                Plan:ISDN, Type:National
Jan 31 13:57:45: ISDN Se1/0:23 Q931: RX <- FACILITY pd = 8  callref = 0x1809

        Facility i = 0x9F8B0100A1080201790201008400 
                Protocol Profile =  Networking Extensions 
                Component = Invoke component 
                        Invoke Id = 121 
                        Operation = CallingName 
                                Name not available

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