Como solucionar problemas e corrigir chamadas que não se conectam depois que o telefone é atendido

Visão geral

Este artigo explica um problema comum em que o telefone chamado é atendido após tocar, mas nenhum áudio é estabelecido. A parte chamada entra no estado de chamada ativa e o temporizador de chamada é iniciado, enquanto a parte chamadora continua ouvindo o tom de retorno.

Modelos aplicáveis

Isso se aplica a todos os modelos de telefone da nossa empresa.

Público-alvo

Este documento é destinado ao pessoal de manutenção diária responsável por solucionar problemas relacionados ao telefone.

Análise do problema

Após o telefone chamado ser atendido, ele envia uma mensagem 200 OK de volta ao chamador. O telefone retorna sua resposta SIP para o endereço contido no cabeçalho VIA da solicitação original. Em algumas implantações, o PBX está localizado em uma rede privada e exposto à rede pública através de mapeamento NAT, mas as mensagens SIP enviadas pelo PBX ainda contêm um endereço IP privado no campo VIA. Como resultado, quando o telefone envia sua resposta, a mensagem não pode ser entregue corretamente ao lado remoto.

Solução

Habilite o recurso “Strict Proxy” na página de configuração do telefone (mostrado em chinês como “兼容特殊服务器”). Após habilitar esse recurso, o telefone não enviará mais respostas SIP para o endereço no cabeçalho VIA. Em vez disso, enviará a resposta diretamente para o endereço especificado no campo SIP Contact.
Abaixo está o método para habilitar “Strict Proxy” no telefone. Este documento usa o X3SG Pro como exemplo:
Faça login na página de gerenciamento web do telefone, vá para “Linha” - “Configurações Avançadas” - marque “Strict Proxy” e clique em Enviar no final da página, conforme mostrado abaixo.
Diagrama de fluxo de configuração do Strict Proxy do telefone

Catálogo
Atendimento ao cliente Telefone
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