Knowledgebase

To fixed the issue of having the inbound traffic come from digits that could be routed instead of anonymous on the SIP header information.

IP Office platform:
Select the "SIP line" and click on  "SIP URI" tab then change the following as shown in the diagram below.
On the SIP Advanced tab, change the Addressing Association Method to “From” Header host-part against ITSP domain.

Smartnode platform:
On the Web GUI, under your SIP interface; select "Address-translation outgoing-call" and on the first row (TO) enter in the DID(User-part) and hit apply

On the CLI:

enable

configure 

context cs

interface sip <Your SIP interface name>

address-translation outgoing-call to-header user-part fix <Your DID>