Issue with SIP trunking CUBE and ITSP

[S N]

Hi All,

I am struggling with SIP 403 forbidden issue between CUBE and Service provider.

We are interconnecting the CUBE with ITSP through SIP trunk and when testing outbound calls it fails with 403 forbidden.

Only thing I can see is both From and To address to the Provider is showing the same name and I tried to bind the source interface but same error.

CUCM iP : 172.27.199.11

CUBE : 172.27.199.1

ITSP SIP Trunk : trunk.abc.com 

Attaching the debug and Sh run

Customer is using BE6S UCS.

Thanks

Sathya

[HARIS_HUSSAIN]

It might happen if you are not sending the calling Number as expected By Provider.

Please check what they are expecting, and adjust accordingly.

Are incoming calls working fine?

Thanks
Haris

[S N]

Thanks Haris.

We haven't checked the incoming calls. The Caller ID is correct.

Only thing I notice is both From and To address is same in the ACK message.

Not sure what is missing or is it an issue from customer end or ITSP end.

Thanks

Sathya

[Abhay Singh Reyal]

As per the sip-ua
registrar dns:trunk.abc.com expires 3600
sip-server dns:trunk.abc.com

Can you make sure the DNS is correctly resolving the domain name to the correct IP address ?

Also in the Invite you are sending the numbers as 0405808398 and 0405808398 [They are getting modified from 00405808398 and 855 respectively], Check if this is what ITSP is expecting.

Sent:
INVITE sip:0405808398@trunk.abc.com:5060 SIP/2.0
Via: SIP/2.0/TCP 172.27.199.1:5060;branch=z9hG4bK23732023
From: <sip:0388400000@trunk.abc.com>;tag=169D7700-38
To: <sip:0405808398@trunk.abc.com>Date: Mon, 20 Mar 2017 08:21:52 GMT
Call-ID: 1AC91544-C7D11E7-BE028CD3-12E18551@172.27.199.1

HTH

Regards

Abhay

[S N]

Thanks Abhay,

The call flow is IP Phone --> Call manager --> CUBE --> ITSP

From phone the calling number is 855 and called number is  00405808398  and from CUBE it is changing as Calling number as 0388400000 and called number as 0405808398.

As per the snapshot you attached , is it OK that both From and To address is same.

Sent:
INVITE sip:0405808398@trunk.abc.com:5060 SIP/2.0
Via: SIP/2.0/TCP 172.27.199.1:5060;branch=z9hG4bK23732023
From: <sip:0388400000@trunk.abc.com>;tag=169D7700-38
To: <sip:0405808398@trunk.abc.com>Date: Mon, 20 Mar 2017 08:21:52 GMT
Call-ID: 1AC91544-C7D11E7-BE028CD3-12E18551@172.27.199.1

Is this should be, From the CUBE IP and To to the ITSP IP ?

Can anyone clarify.

Thanks

Sathya