Erro ao transferir ligações para Ramais indisponíveis

Quando uma ligação é transferida para um ramal que está indisponível, o dialplan do contexto [transferencias] encaminha a ligação para o contexto default com destino à uma extensão vazia, causando erro de Número Inválido para o usuário que está transferindo.
 -- Executing [109@transferencias:1] NoOp("Local/109@transferencias-0000006e;2", "LIGACAO DE 67????0117 PARA 109 NO CANAL Local/109@transferencias-0000006e;2") in new stack
    -- Channel Local/109@transferencias-0000006e;1 joined 'simple_bridge' basic-bridge <4eb0d6e8-06b7-400b-a22b-90e9934e8c4e>
    -- Executing [109@transferencias:2] Set("Local/109@transferencias-0000006e;2", "CHANNEL(language)=pt_BR") in new stack
    -- Executing [109@transferencias:3] GotoIf("Local/109@transferencias-0000006e;2", "0?blind:assisted") in new stack
    -- Goto (transferencias,109,7)
    -- Executing [109@transferencias:7] Set("Local/109@transferencias-0000006e;2", "TCHANNEL=SIP/117-00000874") in new stack
    -- Executing [109@transferencias:8] AGI("Local/109@transferencias-0000006e;2", "snep/get_raw_channel.php,TRANSFERER,SIP/117-00000874") in new stack
    -- Channel SIP/117-00000874 left 'simple_bridge' basic-bridge <19b5ff25-ebcd-421c-9f52-337e4322ba33>
    -- Launched AGI Script /var/lib/asterisk/agi-bin/snep/get_raw_channel.php
    -- Channel SIP/117-00000874 joined 'simple_bridge' basic-bridge <4eb0d6e8-06b7-400b-a22b-90e9934e8c4e>
    -- <Local/109@transferencias-0000006e;2>AGI Script snep/get_raw_channel.php completed, returning 0
    -- Executing [109@transferencias:9] AGI("Local/109@transferencias-0000006e;2", "snep/resolv_extension.php,SIP/117,RAMAL") in new stack
    -- Launched AGI Script /var/lib/asterisk/agi-bin/snep/resolv_extension.php
    -- <Local/109@transferencias-0000006e;2>AGI Script snep/resolv_extension.php completed, returning 0
    -- Executing [109@transferencias:10] GotoIf("Local/109@transferencias-0000006e;2", "0?snep") in new stack
    -- Executing [109@transferencias:11] Set("Local/109@transferencias-0000006e;2", "CALLERID(all)=117") in new stack


[12:15] 
-- Executing [109@transferencias:12] AGI("Local/109@transferencias-0000006e;2", "snep/snep.php,-x,SIP/117") in new stack
    -- Launched AGI Script /var/lib/asterisk/agi-bin/snep/snep.php
 snep/snep.php,-x,SIP/117: 117 -> 109 INFO (6):Identified source: 117 (Snep_Exten)
 snep/snep.php,-x,SIP/117: 117 -> 109 INFO (6):Connection attempt from 117 (SIP/117) to 109
 snep/snep.php,-x,SIP/117: 117 -> 109 INFO (6):Running the rule 1:Internas - Ramal para Ramal
 snep/snep.php,-x,SIP/117: 117 -> 109 INFO (6):Recording with 'mixmonitor'
    -- AGI Script Executing Application: (mixmonitor) Options: (/var/www/html/snep/arquivos/2017-12-12/1513087814_20171212_1110_117_109.wav,b)
  == Begin MixMonitor Recording Local/109@transferencias-0000006e;2
 snep/snep.php,-x,SIP/117: 117 -> 109 INFO (6):Definindo centro de custos para 9.
 snep/snep.php,-x,SIP/117: 117 -> 109 INFO (6):Discando para ramal 109 no canal SIP/109.
    -- AGI Script Executing Application: (Dial) Options: (SIP/109,60,TWKtwkR)
[Dec 12 12:10:14] WARNING[21132][C-0000028f]: app_dial.c:2432 dial_exec_full: Unable to create channel of type 'SIP' (cause 20 - Subscriber absent)
  == Everyone is busy/congested at this time (1:0/0/1)
 snep/snep.php,-x,SIP/117: 117 -> 109 ERR (3):CHANUNAVAIL ao discar para 109
 snep/snep.php,-x,SIP/117: 117 -> 109 INFO (6):End of running the rule 1:Internas - Ramal para Ramal
    -- <Local/109@transferencias-0000006e;2>AGI Script snep/snep.php completed, returning 0
    -- Executing [109@transferencias:13] GotoIf("Local/109@transferencias-0000006e;2", "0?hangup") in new stack
    -- Executing [109@transferencias:14] Goto("Local/109@transferencias-0000006e;2", "default,,1") in new stack
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