VOS3000 Caller Source Header Selection Complete From Remote-Party-ID Display
Configuring VOS3000 caller source header selection determines which SIP header VOS3000 uses to extract the calling party number (CLI) from incoming calls at the mapping gateway. The three available sources — From header, Remote-Party-ID header, and Display name — each provide different caller identity information, and choosing the right one is critical for accurate caller ID presentation, correct billing rate lookups, and proper prefix matching. Misconfigured caller source selection leads to wrong CLI in CDRs, incorrect rate table matches, and caller ID presentation failures that affect both billing and user experience. Need help configuring this? Contact us on WhatsApp: +8801911119966.
In SIP signaling, the calling party identity can appear in multiple headers simultaneously, and these headers may contain different values. The From header always contains a URI with the caller number, but it may be modified by intermediate proxies. The Remote-Party-ID (RPID) header, defined in RFC 3325, provides a more trustworthy identity inserted by the network. The Display name component carries a human-readable caller label. VOS3000 lets you choose which source to trust for CLI extraction at each mapping gateway independently.
Table of Contents
Three Caller Source Options in VOS3000 (VOS3000 Caller Source)
The VOS3000 mapping gateway configuration under §2.5.1.2 provides three caller source options. Each option extracts the calling number from a different part of the SIP INVITE message, and the choice affects how the CLI is used for routing, billing, and presentation downstream.
| Source Option | SIP Header | What Is Extracted |
|---|---|---|
| From | From: <sip:number@host> | User part of the From URI (the number before @) |
| Remote-Party-ID | Remote-Party-ID: <sip:number@host> | User part of the RPID URI (network-trusted identity) |
| Display | From: “Display Name” <sip:number@host> | Display name string from the From header |
When to Use Each VOS3000 Caller Source
Choosing the correct VOS3000 caller source header selection depends on your upstream carrier configuration and how caller identity is delivered in your SIP trunks. Different carriers use different headers for CLI, and using the wrong source will extract incorrect or incomplete caller information.
| Scenario | Recommended Source | Reason |
|---|---|---|
| Standard SIP carrier trunk | From | Most carriers put CLI in From header |
| Carrier with RPID support | Remote-Party-ID | RPID contains network-verified CLI |
| From header has privacy proxy value | Remote-Party-ID | RPID has real CLI behind privacy proxy |
| Display name contains actual number | Display | Some PBX systems put CLI in display name |
| Wholesale interconnect | Remote-Party-ID or From (per carrier) | Depends on interconnect agreement |
From Header Source — Detailed Behavior
When VOS3000 caller source header selection is set to From, the system extracts the user portion of the SIP URI from the From header. This is the most commonly used source because virtually all SIP implementations include the calling number in the From header. However, the From header can be modified by intermediate proxies and does not carry network-verified identity — any SIP user agent can set any value in the From header. For environments where CLI accuracy is critical, the From header alone may not be trustworthy enough.
| Aspect | From Header Source |
|---|---|
| Always present | Yes — mandatory in all SIP requests |
| Trust level | Low — can be spoofed by caller |
| Format | User part of sip:user@host URI |
| Privacy support | May contain anonymous value when privacy requested |
| Best for | Simple deployments without RPID support |
Remote-Party-ID Source — Detailed Behavior
The Remote-Party-ID header, defined in RFC 3325, carries the network-verified identity of the calling party. When a carrier or SIP proxy authenticates the caller, it inserts the RPID header with the verified identity, which may differ from the From header value. Setting VOS3000 caller source header selection to Remote-Party-ID tells VOS3000 to prefer this network-verified identity over the self-declared From header. This is the recommended setting when your upstream carrier provides RPID, as it ensures accurate CLI for both routing and billing. For related CLI management, see our VOS3000 caller ID management guide.
| Aspect | RPID Source |
|---|---|
| Always present | No — only if carrier/proxy inserts it |
| Trust level | High — network-verified identity |
| Privacy indicator | Contains privacy=id tag for caller ID restrictions |
| Screen indicator | Contains screen=yes for verified identity |
| Best for | Wholesale interconnects with carrier CLI verification |
Impact of Caller Source on Billing and Rate Lookup
The extracted caller number is not just used for display — VOS3000 also uses it for prefix matching in rate tables and routing decisions. If the wrong source is selected, the extracted CLI may be incorrect, causing rate table mismatches and billing errors. For example, if the From header contains an anonymous value but the RPID has the real number, selecting From would result in no rate match, while RPID would produce the correct billing. For billing configuration, see our VOS3000 billing system guide. For direct support, message us on WhatsApp: +8801911119966.
| Caller Source | Rate Lookup Impact | CDR Recording |
|---|---|---|
| From (correct CLI) | Correct rate match | Accurate CDR caller number |
| From (anonymous/spoofed) | No rate match or wrong rate | Invalid CDR caller number |
| Remote-Party-ID | Correct rate match with verified CLI | Verified CDR caller number |
| Display (non-numeric) | Rate lookup may fail | Non-numeric CDR caller field |
Related Resources – VOS3000 Caller Source
- VOS3000 Caller ID Management Complete Guide
- VOS3000 Billing System Guide
- VOS3000 P-Asserted-Identity Caller ID
- RFC 3325 – Remote-Party-ID Header
Frequently Asked Questions About VOS3000 Caller Source Header Selection
What is caller source header selection in VOS3000?
Caller source header selection in VOS3000 is a mapping gateway configuration that determines which SIP header the system uses to extract the calling party number. The three options are From (extracts from the standard SIP From header URI), Remote-Party-ID (extracts from the RPID header that carries network-verified identity), and Display (extracts the display name from the From header). This setting is configured per mapping gateway under §2.5.1.2 of the VOS3000 administration manual.
When should I use Remote-Party-ID instead of From?
You should use Remote-Party-ID instead of From when your upstream carrier or SIP proxy inserts the RPID header with the verified calling party identity. The From header can be set to any value by the calling party and may contain anonymous or privacy-shielded values, while RPID is inserted by the network after authentication and represents the verified identity. If your carrier provides RPID headers, using this source ensures more accurate CLI for billing rate lookups and caller ID presentation.
What happens if Remote-Party-ID is selected but not present?
If VOS3000 caller source header selection is set to Remote-Party-ID but the incoming SIP INVITE does not contain an RPID header, VOS3000 falls back to extracting the caller number from the From header. This fallback behavior ensures that calls are not rejected or misrouted simply because the RPID header is absent. However, if the From header also contains an invalid or anonymous value, the CLI extraction will produce incorrect results.
Does caller source selection affect the CDR caller number field?
Yes, the caller source selection directly determines what value appears in the CDR caller number field. If From is selected, the CDR records the number from the From header URI. If Remote-Party-ID is selected, the CDR records the network-verified number from the RPID header. This means that changing the caller source configuration can change what appears in your CDRs, which affects billing reports, dispute resolution, and regulatory compliance records.
Can I use the Display name source for caller ID extraction?
Yes, the Display source option extracts the display name string from the From header (the quoted text before the URI). However, this option should be used with caution because display names are typically free-text strings that may not contain valid phone numbers. This option is useful only when the display name field contains the actual caller number in a specific deployment where PBX systems or carriers use this convention. For most production deployments, From or Remote-Party-ID are the appropriate choices.
How does caller source interact with P-Asserted-Identity?
VOS3000 caller source header selection focuses on the From, Remote-Party-ID, and Display headers. P-Asserted-Identity (PAI) is a separate SIP header defined in RFC 3325 that also carries network-verified identity. VOS3000 has separate configuration for PAI handling, which can work alongside or independently of the caller source selection. In some configurations, the PAI header may be used for outbound caller ID presentation while the caller source setting controls inbound CLI extraction. For detailed PAI configuration, see our VOS3000 PAI guide.
Get Expert VOS3000 Caller ID Configuration
Proper VOS3000 caller source header selection is essential for accurate caller ID extraction, correct billing, and reliable routing. Misconfigured caller source settings can cause billing discrepancies, failed rate lookups, and caller ID presentation issues across your entire network.
Contact us on WhatsApp: +8801911119966
Our VOS3000 specialists can help you configure the optimal caller source settings for each mapping gateway based on your carrier agreements. Reach out today at +8801911119966 and ensure your CLI handling is accurate and reliable.
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