General
Information about the format needed to be used within the SIP INVITE for outbound calls with regards to the FROM, TO and CONTACT headers.
Product
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Voice
Steps
The SIP INVITE should adhere to certain standards.
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Userpart: E.164 internationally formatted number which is owned by the customer or purchased from CM.COM. E.g. +31761234567
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Hostpart: PBX external IP address
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Portnumber: standard port 5060. A different source port can be used which needs to be reflected in the SIP account endpoint configuration within the Voice Management portal.
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Using port 0 we will send the response back to the used source port.
FROM/TO/CONTACT: <userpart>@<hostpart>:<portnumber>
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Calls using the same A- and B-number will be blocked by our SIP Gateway
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Calls are routed with the information received in the CONTACT and VIA headers.