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@from-trunk:2] Macro(“SIP/peer-1-00000000”,
“dial,5151,20”) in new stack
— Executing [s@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@sub-apply_peer_incom_trans_profiles:1]
NoOp(“SIP/peer-1-00000000”, “”) in new stack
— Executing [s@sub-apply_peer_incom_trans_profiles:2]
Return(“SIP/peer-1-00000000”, “”) in new stack
— Executing [s@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.