CME with PRI

[j.huizinga]

Hi,

I have a very weird thing

CME 2811 with a PRI line. When the CME is called from a mobile or land line (within the country) everything works fine.

When the originator is from abroad the call is not successful. What I see is that when a call is coming from abroad, the ISDN message TX -> ALERTING is missing.

Example from a land line within the country calling the customer:

Jul 14 14:55:20.345: ISDN Se0/3/0:15 Q931: RX <- SETUP pd = 8  callref = 0x000F
    Sending Complete
    Bearer Capability i = 0x8090A3
        Standard = CCITT
        Transfer Capability = Speech  
        Transfer Mode = Circuit
        Transfer Rate = 64 kbit/s
    Channel ID i = 0xA98386
        Exclusive, Channel 6
    Calling Party Number i = 0x0180, '*** Land Line number ****'
        Plan:ISDN, Type:Unknown
    Called Party Number i = 0x81, '*** Customer number ***'
        Plan:ISDN, Type:Unknown
Jul 14 14:55:20.381: ISDN Se0/3/0:15 Q931: TX -> CALL_PROC pd = 8  callref = 0x800F
    Channel ID i = 0xA98386
        Exclusive, Channel 6
 Jul 14 14:55:20.393: ISDN Se0/3/0:15 Q931: TX -> ALERTING pd = 8  callref = 0x800F
    Progress Ind i = 0x8188 - In-band info or appropriate now available
Jul 14 14:55:24.701: ISDN Se0/3/0:15 Q931: TX -> CONNECT pd = 8  callref = 0x800F
Jul 14 14:55:24.705: ISDN Se0/3/0:15 Q931: RX <- CONNECT_ACK pd = 8  callref = 0x000F

Example from a international number calling the customer:

Jul 14 14:48:34.800: ISDN Se0/3/0:15 Q931: RX <- SETUP pd = 8  callref = 0x000B
    Sending Complete
     Bearer Capability i = 0x8090A3
        Standard = CCITT
        Transfer Capability = Speech  
        Transfer Mode = Circuit
        Transfer Rate = 64 kbit/s
    Channel ID i = 0xA98384
        Exclusive, Channel 4
    Calling Party Number i = 0x0180, '*** International Number ***'
        Plan:ISDN, Type:Unknown
    Called Party Number i = 0x81, '*** Customer number ***'
        Plan:ISDN, Type:Unknown
Jul 14 14:48:34.820: ISDN Se0/3/0:15 Q931: TX -> CALL_PROC pd = 8  callref = 0x800B
    Channel ID i = 0xA98384
        Exclusive, Channel 4
Jul 14 14:48:34.820: ISDN Se0/3/0:15 Q931: TX -> CONNECT pd = 8  callref = 0x800B
Jul 14 14:48:34.828: ISDN Se0/3/0:15 Q931: RX <- CONNECT_ACK pd = 8  callref = 0x000B

The ISDN message are going from TX->CALL_PROC directly to TX->CONNECT, skips the TX -> ALERTING

Behind this is a provider with a SIP trunk, and they say because of this they miss the SIP 180 RINGING, and call fails.

I have never seen this, any idea?

JH

[Nadeem Ahmed]

What is the IOS version? secondly  alerting are optional without this call be setup, Yes certainly with alerting message you will see this behavior and corresponding inter-operability message would missed that.

can you please provide us the exact call-flow. assuming this is incoming call

Users-----PSTN-------PRI------GW--SIP--CUCM----Phone

Br,
nadeem

[j.huizinga]

Hello Nadeem,

The configuration is like this:

Provider-----E1 PRI--------CME

For the CME there is only a PRI, and SCCP phones. This configuration has worked for at least 7 years with another provider.

IOS version: c2800nm-ipvoicek9-mz.124-15.T7.bin

Only when the CME receives a call from abroad, the CME doesn't send back an ALERTING

Thanks

Jan

[Mohammed al Baqari]

Hi,

This is strange behavior for me as well. Try to configure the global command "voice call send-alert" and the command "progress_ind alert enable 8" under your pots dialpeer.

[Wilson Samuel]

Hi Jan,

I have always had some tweaking required with various International Callers / International Calling.

I would request you to try changing the Incoming Calls with International (calling number) to

        Plan:Unknown, Type:Unknown

HTH