Yealink SIP-T19 E2 T4 Series, Administrator'S Manual

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Configuring Basic Features
473
Connected Line Identification Presentation (COLP)
Connected Line Identification Presentation (COLP) allows IP phones to display the identity of the
connected party specified for outgoing calls. IP phones can display the Dialed Digits, or the
identity in a SIP header (Remote-Party-ID or P-Asserted-Identity) received, or the identity in the
From header carried in the UPDATE message sent by the callee as described in
RFC 4916 .
Connected line identification presentation is also known as Called line identification
presentation. In some cases, the remote party will be different from the called line identification
presentation due to call diversion.
Note
The following sessions show the enhancements of connected line identification according to the
connected line identification source configured on the IP phones.
Connected Line Identification source = PAI-RPID
1)
The IP phone checks Privacy: id header preferentially, if there is a Privacy: id in the 18X or
200OK response, the connected line identification information will be hidden and the IP
phone LCD screen presents anonymous.
2)
If there is not any Privacy: id header in the 18X or 200OK response, the IP phone checks
and presents the connected line identification from the P-Asserted-Identity header.
3)
If there is not P-Asserted-Identity header in the I8X or 200OK response, the IP phone
presents the connected line identification from the Remote-Party-ID header. If no, the IP
phone presents the connected line identification according to the dialed digits.
Connected Line Identification source = Dialed digits
Yealink IP phones present the connected line identification according to the dialed digits.
Connected Line Identification source = RFC4916
Yealink IP phones support to present the connected line identification from UPDATE message
following the
RFC 4916 .
1)
The IP phone receives an UPDATE message during a call, the connected line identification
on the LCD screen should be refreshed according the FROM SIP carried in the UPDATE
message.
For more information on connected line identification presentation, refer to
Calling and
Connected Line Identification Presentation on Yealink IP Phones .
If the callee already exists in the local directory, the local contact name assigned to the callee
should be preferentially displayed.