IPOffice 500 Sip trunk incoming call problem

[oleg090965]

I want to connect Cisco CCM and IPOffice

I Have IPO 500V2 soft 8.0(16)
I create SIP trunk as writen in http://downloads.avaya.com/css/P8/documents/100157032

Calls from IPO to CCM work good.

Calls from CCM to IPO not work

In IPO log i see that IPO answer to CCM
"SIP/2.0 503 Service Unavailable"

CCM have IP 192.168.52.252, telephone number 121
IPO have IP 192.168.42.1, telephone number 114

I need help. Thanks

Above log from Avaya IP Offise SysMonitor
CCM->IPO
INVITE sip:114@192.168.42.1:5060 SIP/2.0
Date: Fri, 04 May 2012 08:51:25 GMT
Call-Info: <sip:192.168.52.252:5060>;method="NOTIFY;Event=tel ephone-event;Duration=500"
Allow: INVITE, OPTIONS, INFO, BYE, CANCEL, ACK, PRACK, UPDATE, REFER, SUBSCRIBE, NOTIFY, PUBLISH
From: <sip:121@192.168.52.252>;tag=0cd4ed1f-0b41-4066-88ea-b08c1fedccf6-32280117
Allow-Events: presence, kpml
Supported: timer,replaces
Min-SE: 1800
Remote-Party-ID: <sip:121@192.168.52.252>;party=calling;screen=yes; privacy=off
Content-Length: 0
User-Agent: Cisco-CUCM6.1
To: <sip:114@192.168.42.1>
Contact: <sip:121@192.168.52.252:5060;transport=tcp>
Expires: 180
Call-ID: 53302a00-fa31988d-115a8-fc34a8c0@192.168.52.252
Via: SIP/2.0/TCP 192.168.52.252:5060;branch=z9hG4bK1a167ea86641
CSeq: 101 INVITE
Session-Expires: 1800
Max-Forwards: 70
207991mS CMCallEvt: 0.1003.0 -1 BaseEP: NEW CMEndpoint f51c8840 TOTAL NOW=1 CALL_LIST=0
207991mS Stun: Info: media ports will not be mapped with STUN.
207991mS Sip: License, Valid 1, Available 10, Consumed 0
207994mS SIP Call Tx: 17

IPO->CCM
SIP/2.0 100 Trying
Via: SIP/2.0/TCP 192.168.52.252:5060;branch=z9hG4bK1a167ea86641
From: <sip:121@192.168.52.252>;tag=0cd4ed1f-0b41-4066-88ea-b08c1fedccf6-32280117
To: <sip:114@192.168.42.1>;tag=5989a974c779705a
Call-ID: 53302a00-fa31988d-115a8-fc34a8c0@192.168.52.252
CSeq: 101 INVITE
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY, INFO, UPDATE
Supported: timer
Content-Length: 0

And next packet from IPO-> to CCM
SIP/2.0 503 Service Unavailable
Via: SIP/2.0/TCP 192.168.52.252:5060;branch=z9hG4bK1a167ea86641
From: <sip:121@192.168.52.252>;tag=0cd4ed1f-0b41-4066-88ea-b08c1fedccf6-32280117
To: <sip:114@192.168.42.1>;tag=5989a974c779705a
Call-ID: 53302a00-fa31988d-115a8-fc34a8c0@192.168.52.252
CSeq: 101 INVITE
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY, INFO, UPDATE
Supported: timer
Content-Length: 0