E1 access problem in SRST

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Mar 26th, 2007
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I upgraded the IOS and the IP Phone are registered, but for outgoing calls not works. I made a call using CSIM command and the call works. The router are connect to PSTN by E1 PRI.Pls. see the SRST config:


max-conferences 8 gain -6

transfer-system full-consult

ip source-address <IP CCM> port 2000

max-ephones 96

max-dn 120

access-code pri 9 direct-inward-dial

time-zone 11

date-format dd-mm-yy

This is the dial-peer for outgoing calls:

dial-peer voice 100 pots

destination-pattern 9


port 0/0/0:15



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Overall Rating: 4 (2 ratings)
cristian.munoz Tue, 03/27/2007 - 14:33
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Dear Ale

Are you sure that this work?.

I made tests using 9.T and do not work.

paolo bevilacqua Tue, 03/27/2007 - 14:59
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9.T and variations are indeed right in most cases. To find out why calls are failing, do "debug isdn q931" and "term mon".

cristian.munoz Tue, 03/27/2007 - 15:05
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Dear Paolo

See the debug q931.

Mar 23 04:08:45.011: ISDN Se0/0/0:15 Q931: TX -> SETUP pd = 8 callref = 0x0091

Bearer Capability i = 0x8090A3

Standard = CCITT

Transfer Capability = Speech

Transfer Mode = Circuit

Transfer Rate = 64 kbit/s

Channel ID i = 0xA9839F

Exclusive, Channel 31

Progress Ind i = 0x8183 - Origination address is non-ISDN

Calling Party Number i = 0x0180, '6912'

Plan:ISDN, Type:Unknown

Called Party Number i = 0x81

Plan:ISDN, Type:Unknown

*Mar 23 04:08:45.039: ISDN Se0/0/0:15 Q931: RX <- SETUP_ACK pd = 8 callref = 0x8091

Channel ID i = 0xA9839F

Exclusive, Channel 31

Progress Ind i = 0x8288 - In-band info or appropriate now available

*Mar 23 04:08:46.171: ISDN Se0/0/0:15 Q931: TX -> DISCONNECT pd = 8 callref = 0x0091

Cause i = 0x8090 - Normal call clearing

*Mar 23 04:08:46.191: ISDN Se0/0/0:15 Q931: RX <- RELEASE pd = 8 callref = 0x8091

*Mar 23 04:08:46.191: ISDN Se0/0/0:15 Q931: TX -> RELEASE_COMP pd = 8 callref = 0x0091

paolo bevilacqua Tue, 03/27/2007 - 15:11
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Hi, there is no called number in setup. Sorry, I'm not familiar with CCM/SRTS, hope someone can help better.

cristian.munoz Tue, 03/27/2007 - 15:39
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Hi,I either i see it.

I configured SRST using FXO and it has work fine, but this is my first tiem using E1 PRI.

I access to E1 channel but i can?t dial the follow digits.

cristian.munoz Thu, 04/05/2007 - 05:56
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Who has any idea?

I can?t do outbound calls by E1 in FallBack mode.

paolo bevilacqua Thu, 04/05/2007 - 07:26
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please change the dial-peer for outgoing calls to:

destination-pattern 9T

check again with "debug isdn q931" what number goes out, if 9 is not removed, you will need to configure a translation-rule to remove it (not difficult).

Hope this helps, please rate all useful posts!

pacameron Sun, 04/08/2007 - 03:55
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Instead of using the 'access-code pri 9 direct-inward-dial' command, remove it and add 'secondary-dialtone 9'.

The 'access-code' commands actually creates temporary dial peers in the 20XXX range and these could be conflicting with your existing dial peers. You can check this by entering 'show call-manager-fallback dial-peer' while in SRST to see if this is happening.

With the 'secondary-dialtone 9' command, the router will play a different dial tone after dialing the '9' access code, this number and the rest of the digit string will then match on dial peer 100 (assuming the destination pattern on this dial peer is 9T) ... the leading 9 will be stripped off and the call should proceed correctly.

cristian.munoz Sun, 04/08/2007 - 07:06
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Dear Paul

Last Thursday i run the command destiantion-pattern 9T and adding secondary-dialtone 9 , and this works!.



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