[Asterisk-Users] Zaptel warning

[VoIP Newbie]

Hi all,

When I was making calls from an IP phone, through a X100P, to PSTN,
the following error was encountered.

    -- Executing Dial("SIP/25086937-aa6c", "Zap/1/91713545") in new stack
    -- Called 1/91713545
    -- Zap/1-1 answered SIP/25086937-aa6c
Aug  6 00:12:53 WARNING[3983]: chan_zap.c:4717 zt_indicate: Don't know
how to set condition 16 on channel Zap/1-1
    -- Started music on hold, class 'default', on Zap/1-1
    -- Stopped music on hold on Zap/1-1
    -- Hungup 'Zap/1-1'

Any idea for this problem?

Many thanks.
Newbie