Connected line had changed


I´m getting the following message on the Asterisk console every time there´s an incoming call from the FXO interface.

– SIP/abfxs-0000013a connected line has changed. Saving it until answer for DAHDI/1-1

I´d like to know the meaning of it, why does it appear. I´ve been looking through the forum and googling it but there´s no information about it. Not even in ¨Asterisk: The definitive guide¨.

Is it documented anywhere?

chan.sip.c line 15467, ‘Notify the peer that the connected line has changed’

From the Wiki:

Connected Line ID: The Connected Line ID information describes who is connected to the other end of a call while a call is established. Unlike Caller ID, the connected line information can change over the life of a call when call transfers are performed. The connected line information can also change in either direction because either end could transfer the call. For ISDN it is known as Connected Line Identification Presentation (COLP), Connected Line Identification Restriction (COLR), and Explicit Call Transfer (ECT). For SIP it is known either as P-Asserted-Identity or Remote-Party-Id.

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Thank you so much! Pretty useful information, know I get it.