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Use SIP P-Asserted-Identity as ISDN CgPN on Cisco AS5400

Use SIP P-Asserted-Identity as ISDN CgPN on Cisco AS5400

Use SIP P-Asserted-Identity as ISDN CgPN on Cisco AS5400

Please could you help to find solution to use the PAI from SIP to ISDN.
The Call-Routing is:
SIP --> Cisco AS5400 --> ISDN
In the INVITE Message I have the following:
INVITE sip:123456789@x.x.x.x:5060;user=phone SIP/2.0
Via: SIP/2.0/UDP y.y.y.y:5060;branch=z9hG4bK67cess10e8h14gs446g1.1
From: <sip:anonymous@anonymous.invalid;user=anonymous>;tag=4DD6C1E0-3A92EFD-0A11F621
To: <sip:123456789@x.x.x.x:5060;user=phone>
Call-ID: 4DD6C1E0-007BFD35@hhh
Accept: application/sdp,application/isup,multipart/mixed,application/vnd.siemens.key-event,application/vnd.siemens.surpass,application/dtmf-relay
Contact: <sip:y.y.y.y:5060;transport=udp>
MIME-Version: 1.0
Privacy: id
Supported: timer,100rel
Max-Forwards: 59
P-Asserted-Identity: <sip:912345678@y.y.y.y;user=phone>
Session-Expires: 1800
Content-Type: application/sdp
Content-Length: 327

My problem is that instead of the PAI , the SIP-URI of the FROM (anonymous) get used in the ISDN SETUP Message:

May 22 08:45:17.358: ISDN Se7/3:15 Q931: Applying typeplan for sw-type 0x12 is 0x0 0x0, Calling num anonymous
May 22 08:45:17.362: ISDN Se7/3:15 Q931: Applying typeplan for sw-type 0x12 is 0x0 0x0, Called num 123456789
May 22 08:45:17.362: ISDN Se7/3:15 Q931: TX -> SETUP pd = 8  callref = 0x4267
        Bearer Capability i = 0x8090A3
                Standard = CCITT
                Transfer Capability = Speech
                Transfer Mode = Circuit
                Transfer Rate = 64 kbit/s
        Channel ID i = 0xA9839F
                Exclusive, Channel 31
        Calling Party Number i = 0x0080, 'anonymous'
                Plan:Unknown, Type:Unknown
        Called Party Number i = 0x80, '123456789'
                Plan:Unknown, Type:Unknown
May 22 08:45:17.506: ISDN Se7/3:15 Q931: RX <- SETUP_ACK pd = 8  callref = 0xC267
        Channel ID i = 0xA9839F
                Exclusive, Channel 31
May 22 08:45:32.498: ISDN Se7/3:15 Q931: RX <- DISCONNECT pd = 8  callref = 0xC267
        Cause i = 0x829C - Invalid number format (incomplete number)
I've configured remote-party-id in the sip-ua config-mode but when I make show run it doesn't get displayed.

I use the following IOS version :
Cisco IOS Software, 5400 Software (C5400-JK9S-M), Version 12.4(25e), RELEASE SOFTWARE (fc2)



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