AHMEDABAD<\/a>: The CG road-based illegal international telephone exchange racket<\/a>, based on session initiation protocol (SIP), a popular internet telephony protocol using cloud-based services, is the first-of-its-kind in the country.

A team of Ahmedabad crime branch and the department of telecom (DoT) officials have now unearthed a racket that has serious security implications. The kingpin of the racket, identified only as 'Sheriyar', hails from Dhaka in Bangladesh.

Cops said he facilitated the establishment of exchanges, some of which routed a huge number of international calls from the residents of Pakistan, India and Bangladesh. A lookout notice has been issued for Sheriyar, who according to cops is now based in Dubai.

Besides, these calls have also caused a huge loss to the telecom companies. \"We could get the call data records of only about 1,098 SIP lines. One line can host 1,000 calls at a time,\" said the officer. \"The initial target was to unravel the details of 2,700 calls in all. The analysis could reveal more information. These 43 lakh calls might be the tip of the iceberg.\"

The racket was unearthed after officers received an input that a Sarkhej resident, Tabrez Kataria, was operating the illegal telephone exchange<\/a>.

Kataria's exchange converted VoIP (Voice over Internet Protocol) calls to GSM (Global System for Mobile Communication) calls for countries where internet telephony is regulated.

Kataria, with the help of a Kerala-based man, used an SIP line to provide this illegal service to their main operator in the Gulf. Later, it was determined that a Dubai resident, Rafiq Babu, was among the accomplices.

Further investigation exposed the racket's links to Sheriyar, who police say has connections in a UAE telecom company.

Investigators have deduced that he provided calling cards to some labourers working in the UAE and other Gulf countries. As for the 43 lakh calls, checking the details of all those conversations is humanly impossible, said a police officer.

\"These calls, which could not be recorded, may have been used to run extortion or hawala rackets,\" said the officer. \"Worse, they could relate to operations which pose a threat to the country's internal security.\" The officer added: \"We have a strong apprehension that the hawala mafia used this exchange.\"

While explaining the SIP-based VoIP call rerouting, the official said, \"SIP doesn't work alone during VoIP calls. Several other protocols work along with it to ensure voice data reaches its destination. The session description protocol (SDP) is one such protocol.\"

SIP connects with IP endpoints to share signalling details, whereas SDP sends session-related information to assist participants in joining or receiving session details. It transmits three sorts of data: session description, time description and media description, the officer explained.

\"SDP does not transfer this information. Session descriptions are instead supplied as a payload in SIP communications. Before being sent over the network, speech data is encoded using codecs, which convert audio impulses into binary data. Many codecs are used for this purpose,\" he added.

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古吉拉特邦:CG道路空间路由43十万的难以捉摸的电话

CG道路非法国际电话交换球拍,基于会话初始化协议(SIP),一个流行的互联网电话协议使用基于云的服务,在全国首开先河。

阿施施Chauhan,
TNN

更新2022年1月10日07:39点坚持

艾哈迈达巴德:CG非法国际道路电话交换机球拍基于会话初始化协议(SIP),一个流行的互联网电话协议使用基于云的服务,在全国首开先河。

艾哈迈达巴德犯罪分支和电信部门(点)官员已经发掘出一个球拍,有严重的安全隐患。球拍的主要人物,被称为“Sheriyar”,来自孟加拉国的达卡。

警察说,他促进了交流,其中一些路由大量居民的国际电话巴基斯坦,印度和孟加拉国。Sheriyar注意通知已发布,据警察现在是总部设在迪拜。

除此之外,这些调用也电信公司造成巨大的损失。“我们可以调用数据记录的只有约1098口线。一行可以举办一次1000个电话,”警官说。“最初的目标是解决2700个电话在所有的细节。分析可以揭示更多的信息。这些43个十万的调用可能是冰山的一角”。

球拍后发现官员收到一个输入,Sarkhej居民Tabrez Kataria,操作非法的电话交换机。

Kataria交换转换的VoIP(互联网协议语音)调用GSM(全球移动通信系统)呼吁国家监管互联网电话。

Kataria Kerala-based男人的帮助,使用一个SIP提供非法服务他们的主要运营商在海湾地区。之后,确定迪拜居民,拉菲克先生,是帮凶。

进一步调查暴露了球拍的链接Sheriyar,警方表示已连接在阿联酋电信公司。

调查人员推断他提供名片一些劳动者在阿联酋工作和其他海湾国家。至于43个十万的电话,检查所有这些对话的细节对任何一个人是不可能的,一个警察说。

“这些调用,不能记录,可能是用来运行勒索或低位球拍,”警官说。“更糟的是,他们可以与操作对该国的内部安全构成威胁。”The officer added: "We have a strong apprehension that the hawala mafia used this exchange."

解释基于SIP的VoIP电话重路由时,这位官员说,“喝不独自工作在VoIP电话。其他协议与它一道,确保语音数据到达目的地。会话描述协议(SDP)就是这样的一个协议。”

SIP与IP端点共享信号的细节,而SDP发送会话相关信息协助参与者加入或接收会话的细节。它传递三种数据:会话描述,描述和媒体描述,官解释说。

“SDP不传输这些信息。在SIP会话描述而不是作为有效载荷提供通信。通过网络发送之前,语音数据使用解码器编码,音频脉冲转换成二进制数据。很多编解码器用于此目的,”他补充道。