{"id":510,"date":"2026-09-16T18:42:17","date_gmt":"2026-09-16T21:42:17","guid":{"rendered":"https:\/\/orlandoneto.com\/?page_id=510"},"modified":"2026-09-17T00:59:39","modified_gmt":"2026-09-17T03:59:39","slug":"isup","status":"publish","type":"page","link":"https:\/\/orlandoneto.com\/index.php\/isup\/","title":{"rendered":"isup"},"content":{"rendered":"\n
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ISUP<\/h3><\/div><\/div>

Protocolo de sinaliza\u00e7\u00e3o utilizado na comunica\u00e7\u00e3o entre centrais telef\u00f4nicas, respons\u00e1vel pelo estabelecimento, manuten\u00e7\u00e3o e encerramento de chamadas na rede TDM.<\/p><\/div><\/div>\n<\/div><\/div>\n\n\n\n

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O que \u00e9 ISUP<\/h3><\/div><\/div>

O ISUP (ISDN User Part) \u00e9 um protocolo de sinaliza\u00e7\u00e3o utilizado na rede telef\u00f4nica tradicional (TDM), especialmente nas centrais que operam com sinaliza\u00e7\u00e3o SS7.

Ele permite que as centrais troquem informa\u00e7\u00f5es sobre chamadas, como n\u00famero de origem e destino, recursos necess\u00e1rios e o estado da chamada.

O ISUP \u00e9 fundamental para a interconex\u00e3o entre operadoras, permitindo que chamadas sejam estabelecidas de forma segura e eficiente.<\/p><\/div><\/div>\n<\/div>\n\n\n\n

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Como o ISUP se encaixa na rede <\/div><\/div>\n\n\n\n
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Central A<\/h3><\/div>

(origem)<\/p><\/div><\/div>\n<\/div>\n<\/div>\n\n\n\n

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ISUP<\/h3><\/div>

(SS7)<\/p><\/div><\/div>\n<\/div>\n<\/div>\n\n\n\n

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Central B<\/h3><\/div>

(destino)<\/p><\/div><\/div>\n<\/div>\n<\/div>\n\n\n\n

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Rede p\u00fablica<\/h3><\/div>

(TDM\/VoIP)<\/p><\/div><\/div>\n<\/div>\n<\/div>\n<\/div>\n\n\n\n

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Rede SS7<\/h3><\/div>

(controle e sinaliza\u00e7\u00e3o)<\/p><\/div><\/div>\n<\/div>\n<\/div>\n\n\n\n

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Principais mensagens<\/h3><\/div><\/div>

O ISUP utiliza v\u00e1rias mensagens para gerenciar o ciclo de vida da chamada. As mais importantes s\u00e3o:<\/p><\/div><\/div>\n<\/div><\/div>\n\n\n\n

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IAM<\/span>

Initial Address Message<\/h3><\/div>

Envia o n\u00famero de destino e inicia o processo de chamada<\/p><\/div><\/div>\n<\/div>\n<\/div>\n\n\n\n

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ACM<\/span>

Address complete message<\/h3><\/div>

Confirma que o destino foi identificado e o roteamento est\u00e1 ok<\/p><\/div><\/div>\n<\/div>\n<\/div>\n\n\n\n

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CPG<\/span>

Call progress<\/h3><\/div>

Inidica o progresso da chamada (ex.: ring, early media, etc..)<\/p><\/div><\/div>\n<\/div>\n<\/div>\n\n\n\n

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ANM<\/span>

Answer message<\/h3><\/div>

Confirma que a chamada foi atendida e a conex\u00e3o est\u00e1 estabelecida<\/p><\/div><\/div>\n<\/div>\n<\/div>\n<\/div>\n\n\n\n

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REL<\/span>

Release<\/h3><\/div>

Encerra a chamada, informando a causa do t\u00e9rmino (REL\/Q.850)<\/p><\/div><\/div>\n<\/div>\n<\/div>\n\n\n\n

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RLC<\/span>

Release complete<\/h3><\/div>

Confirma que a libera\u00e7\u00e3o foi conclu\u00edda e os recursos foram liberados<\/p><\/div><\/div>\n<\/div>\n<\/div>\n\n\n\n

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Fluxo de uma chamada (call flow)<\/h3><\/div><\/div>

Abaixo, um exemplo simplificado de fluxo de sinaliza\u00e7\u00e3o ISUP em uma chamada<\/p><\/div><\/div>\n<\/div><\/div>\n\n\n\n

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1 – IAM<\/h3><\/div>

Destino(551193571245)<\/p><\/div><\/div>\n<\/div>\n<\/div>\n\n\n\n

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2 – ACM<\/h3><\/div>

Destino aceito<\/p><\/div><\/div>\n<\/div>\n<\/div>\n\n\n\n

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3 – CPG<\/h3><\/div>

Ring<\/p><\/div><\/div>\n<\/div>\n<\/div>\n\n\n\n

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4 – ANM<\/h3><\/div>

Chamada atendida<\/p><\/div><\/div>\n<\/div>\n<\/div>\n\n\n\n

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5 – REL<\/h3><\/div>

Encerramento <\/p><\/div><\/div>\n<\/div>\n<\/div>\n\n\n\n

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6 – RLC<\/h3><\/div>

Libera\u00e7\u00e3o conclu\u00edda<\/p><\/div><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div><\/div>\n\n\n\n

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Principais causas de falha (REL \/ Q.850)<\/h3><\/div><\/div>

Algumas das causas mais comuns que podem aparecer no REL:<\/p><\/div><\/div>\n\n\n\n

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C\u00f3digo<\/div><\/div>\n<\/div>\n<\/div>\n\n\n\n
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Significado<\/div><\/div>\n<\/div>\n<\/div>\n\n\n\n
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Poss\u00edvel causa<\/div><\/div>\n<\/div>\n<\/div>\n<\/div>\n\n\n\n
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16<\/div><\/div>\n<\/div>\n<\/div>\n\n\n\n
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Normal call clearing<\/div><\/div>\n<\/div>\n<\/div>\n\n\n\n
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Encerramento normal da chamada<\/div><\/div>\n<\/div>\n<\/div>\n<\/div>\n\n\n\n
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17<\/div><\/div>\n<\/div>\n<\/div>\n\n\n\n
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User busy<\/div><\/div>\n<\/div>\n<\/div>\n\n\n\n
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Destino ocupado<\/div><\/div>\n<\/div>\n<\/div>\n<\/div>\n\n\n\n
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21<\/div><\/div>\n<\/div>\n<\/div>\n\n\n\n
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Call rejectd<\/div><\/div>\n<\/div>\n<\/div>\n\n\n\n
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Politica ou bloqueio<\/div><\/div>\n<\/div>\n<\/div>\n<\/div>\n\n\n\n
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34<\/div><\/div>\n<\/div>\n<\/div>\n\n\n\n
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No circuit<\/div><\/div>\n<\/div>\n<\/div>\n\n\n\n
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Falta de recursos na rede<\/div><\/div>\n<\/div>\n<\/div>\n<\/div>\n\n\n\n
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Ver lista completa<\/span><\/a><\/div><\/div><\/div>\n<\/div>\n<\/div>\n\n\n\n
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Rela\u00e7\u00e3o com SIP<\/h3><\/div>

Em cen\u00e1rios de interconex\u00e3o (getway, SBC, TAS\/AS), as causas ISUP podem ser mapeadas para respostas SIP, mas n\u00e3o existe uma rela\u00e7\u00e3o 1:1. O mapeamento depende do equipamento, configura\u00e7\u00e3o e contexto da chamada<\/p><\/div><\/div>\n\n\n\n

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REL\/Q.850<\/h3><\/div>

(causa de sinaliza\u00e7\u00e3o)<\/p><\/div><\/div>\n<\/div>\n<\/div>\n\n\n\n

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\n\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t<\/path><\/svg>\n\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t<\/div>\n<\/div>\n\n\n\n
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SIP reason<\/h3><\/div>

(transporte e mapeamento)<\/p><\/div><\/div>\n<\/div>\n<\/div>\n<\/div>\n\n\n\n

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<\/div>

Exemplo: REL 34 (no circuit \/ channel available) pode resultar em erro 503 (service unavailable) em alguns cen\u00e1rios, mas em outros pode ser mapeado para 480 (temporarily unavailable).<\/p><\/div><\/div>\n<\/div>\n<\/div>\n<\/div><\/div>\n\n\n\n

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