[asterisk-users] Problem with IF

[SAMPro]

Hi
I need to check the return value of a sub, the sub may return empty so I
need to check for that. If the return value isn't empty set another
variable (ARG1) . This is the code I've used in extension.conf, but didn't
work (the CLI log is after the code).

*Extension.conf:*

[macro-dial]
same => 1,GosubIf($["${CHANNEL(peername):0:4}" =
"peer"]?sub-apply_peer_incom_trans_profiles,s,1(${ARG1}))
same => n,Set(ARG1=${IF($["${GOSUB_RETVAL}" != "" & "${GOSUB_RETVAL}" !=
"0"]?${GOSUB_RETVAL}:${ARG1})})

[sub-apply_peer_incom_trans_profiles]
exten => s,1,NoOp()
;Currently this sub is empty because no profile is set.
same => n,Return()

*The CLI logs:*

    -- Executing [5151 at from-trunk:2] Macro("SIP/peer-1-00000000",
"dial,5151,20") in new stack
    -- Executing [s at macro-dial:1] GosubIf("SIP/peer-1-00000000",
"1?sub-apply_peer_incom_trans_profiles,s,1(5151)") in new stack
  == Channel 'SIP/peer-1-00000000' jumping out of macro 'dial'
    -- Executing [s at sub-apply_peer_incom_trans_profiles:1]
NoOp("SIP/peer-1-00000000", "") in new stack
    -- Executing [s at sub-apply_peer_incom_trans_profiles:2]
Return("SIP/peer-1-00000000", "") in new stack
    -- Executing [s at macro-dial:2] Set("SIP/peer-1-00000000", "ARG1=") in
new stack

We are using Asterisk 11.

The return value of "sub-apply_peer_incom_trans_profiles" may contain
nothing or 0 characters (from a regex expression evaluation).
I can simply return ARG1 in  "sub-apply_peer_incom_trans_profiles" to
resolve the issue, but this really challenged me to find another solution
and make IF work.

Thanks in advance.
Regards.
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