AgentCallBackLogin is no longer?

is it true that AgentCallBackLogin cause deadlocks?

i try in trixbox_2.6.1-vmware (asterisk 1.4) on extension_custom:

exten => 28,n,AgentCallbackLogin(||${CALLERIDNUM}@from-internal)

and i got:

 -- Executing [28@from-internal:1] ResetCDR("SIP/201-08294620", "") in new stack
    -- Executing [28@from-internal:2] NoCDR("SIP/201-08294620", "") in new stack
    -- Executing [28@from-internal:3] Wait("SIP/201-08294620", "1") in new stack
    -- Executing [28@from-internal:4] Playback("SIP/201-08294620", "silence/1&cannot-complete-as-dialed&check-number-dial-again|noanswer") in new stack
    -- <SIP/201-08294620> Playing 'silence/1' (language 'en')
    -- <SIP/201-08294620> Playing 'cannot-complete-as-dialed' (language 'en')
    -- <SIP/201-08294620> Playing 'check-number-dial-again' (language 'en')
    -- Executing [28@from-internal:5] AgentCallbackLogin("SIP/201-08294620", "||@from-internal") in new stack
[Sep 25 09:44:31] WARNING[5070]: chan_agent.c:2312 callback_deprecated: AgentCallbackLogin is deprecated and will be removed in a future release.
[Sep 25 09:44:31] WARNING[5070]: chan_agent.c:2313 callback_deprecated: See doc/queues-with-callback-members.txt for an example of how to achieve
[Sep 25 09:44:31] WARNING[5070]: chan_agent.c:2314 callback_deprecated: the same functionality using only dialplan logic.

this result is on all 1.4 distributions? or only on trixbox?

my chan_agent.c version is:Revision: 114248

from this Revision AgentCallBackLogin is no longer exists?

On all 1.4.x * releases.

Cheers.

Marco Bruni