This guide will help you configure your Zultys MX PBX for use with SIP.US service.
1. From your Zultys Administration software, select "Provision," then "SIP Servers and ITSPs".
2. Select the "ITSPs" tab and then modify an existing ITSP or add a new one. The settings for each section are detailed below:
A. Under the "Servers List" section:
- Use "Request using DNS_SRV from" and set that field to "gw.sip.us". SIP.US recommends this method, because there are now four redundant primary SIP gateways.
- Alternately, You can manually add gw4.sip.us and gw5.sip.us (added under the "Servers" tab (not shown in this guide)).
NOTE: See Interconnecting with SIP.US for the complete list of gateway IPs and whitelisting requirements.
B. Under the "Registration" section, select the "Register" checkbox and use "Digest" for "Auth Type". Enter your SIP trunk details as shown in the picture below.
- User Name: Your SIP trunk #
- Auth Name: Your SIP trunk #
- Timeout: 1800 (seconds)
- Password: Your SIP trunk password found in the customer portal
3. Select the "From" domain "SIP Headers" tab, and set it to "Use the following Address,"
- Enter "gw.sip.us" in this field if you used the SRV record.
- Otherwise, "gw4.sip.us" as the address to be used.
IMPORTANT: Failure to do this will result in your outbound call attempts and registration attempts being rejected by our server. This is because SIP.US requires the FROM and TO headers to be addressed to our gateways for the domain.
4. Select the ""TO" domain" tab and ensure "Use the domain for the appropriate server in the Servers List" is selected.
5. Select the "Request-URI" tab. Under "Request-URI" you must select "FQDN".
6. Select the "Caller ID" tab. In this tab you have some options. You may choose to send your caller ID in the "FROM" header of your SIP packet. By default, this is where SIP.US looks for the number to transmit as the caller ID.
However, many customers find more flexibility in using the "P-Asserted-Identity" header (as shown in the photo). If you choose to add this header, you must select "Modify Trunk" in your SIP.US portal under the "SIP Trunks" tab and set the "Outbound CID Header" field to "PAI."
7. Select the "Misc" tab and ensure that "Ignore Domain received in From/To SIP Headers" is checked.
8. Edit the SIP Profile applied to the ITSP for SIP.US, and ensure that the profile is set to look for the DID number in the "To header" as shown in the photo below. Failure to complete this step will result in inbound calls failing.
Once you have completed these steps and have applied the settings, your SIP trunk should show as "Registered" in the SIP.US portal. After that, inbound and outbound calls may be completed.
SIP.US further recommends viewing these articles on Setting Up Outbound Calling and Setting Up Caller ID to confirm the configuration settings match the requirements to use our SIP service.
If you experience any issues with your configuration, please contact our Support team at support@sip.us.