[Nick]

We have As5300 with 4 PRI E1 connected with Ericsson AXE-10. We have not been able to achive over 100 active calls.

Now Ericsson retun 0x82AF code. Can anyone suggest wht is required to do?

Thanx

Nick

[Matthew Webster]

Can you show me the complete call scenario?

Is this a PRI setup with release or release complete?

The problem will probably be in your setup message.

HTHs,
Matthew.

[Nick]

Thanx Matt.
The HWM is stuck @ 100. We have run debug isdn q931 and recived following:

Jul 16 15:26:41.282 GMT: ISDN Se0:15 Q931: TX – SETUP pd = 8 callref = 0x1CCE
Bearer Capability i = 0x9090A3
Standard = CCITT
Transer Capability = 3.1kHz Audio
Transfer Mode = Circuit
Transfer Rate = 64 kbit/s
Channel ID i = 0xA98381
Exclusive, Channel 1
Calling Party Number i = 0x81, ‘210345’
Plan:ISDN, Type:Unknown
Called Party Number i = 0xA1, ‘8639715’
Plan:ISDN, Type:National
Jul 16 15:26:41.462 GMT: ISDN Se0:15 Q931: RX

[Matthew Webster]

Hi Nick,

There could be a few issues here, but as you will know the full picture I’ll attempt to give you the right information.

1. The called party number TON (Type of Number) is ‘national’. This normally takes the form NDC + SN where:
i) NDC = national destination code (or similar). This means the area code of the number you are calling – for example, for London, UK it is ’20’.
ii) SN = the actual number of the subscriber, and follows immediately after the NDC. It can vary in length, depending on your carrier’s subscriber numbering plan. For example in London, all SNs are 8 digits and start with a ‘7’ or an ‘8’- e.g. ‘7515 7297’ or ‘8940 6723’.

What it does NOT include is the access code you dial to get to London, which within the UK is ‘0’.So, 020-xxxxyyyy would have a TON of unknown, as ‘020’ is not in national format. National format is the ‘NDC’ + ‘SN’, so the number, in national format would be 20-xxxxyyyy.

Depending on the access digits and NDC you may be dialling an ‘unknown format’ but telling the AXE it is in ‘national format’. This can cause the call setup to fail.

All this is irrelevant if you’re dialling a local number and don’t need to include the NDC. In that case, your TON should be ‘unknown’ (I think), as the number isn’t in the form NDC+SN.

2. The Bearer capability looks OK, although if you’re making a speech call, then it is normal to use an ITC of ‘speech’, instead of ‘3.1kHz’ audio. This can also cause problems at the switch, and is a popular area where calls can get rejected in the setup phase.

All said, though, I looked at the release cause you are receiving from the AXE: 0x82AF. This is better seen in binary:
82 = 10000010. The first bit is the ext bit. The next two bits indicate the coding standard, which is CCITT. The next bit is reserved. The next four bits are the location ‘public network serving the local user’, which makes sense.
AF = 10101111. The first bit is the ext bit. The next seven bits indicate the cause code reason, which in this case is “Resource Unavailable, Unspecified”.

This cause code comes from the AXE block PHPA – the block that handles Layer 3 protocols (within the subscriber control subsystem, traffic control for ISDN section). There is also MHPA, which builds and decodes Layer 3 information
in the same subsystem. This cause code could be generated because the switch doesn’t have the resource, or, type of resource you are asking for in the bearer capability (BC) part of your setup message.

I’ve found a Cisco link which tells you how to change the BC values to speech when setting up these types of calls:

http://www.cisco.com/en/US/tech/tk652/tk701/technologies_tech_note09186a0080093f62.shtml

HTHs,
Matthew.

[Nick]

Hi Matt
We did change the bearer capcity and also divided the 4E1 into two seprate groups just to eliminate the doubt that AXE-10 may have some default value on PBX.

Done all that we still stuck on 100 active calls constraint. HWM is not going above 100. We are reciving huge 2F codes from switch.

Nick
majha@yahoo.com

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