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Voice is supported only on VWIC type cards. VWIC stands for Voice WAN Interface Card. So these cards can be used both for Voice and WAN (data).<br />
Even if you have a VWIC card, you still need to install DSP modules (PVDM) on your router. DSP converts T1 voice to packet voice and vice versa (voip). On a 2600 router you need an NM-HDV network module which carries both the T1 card and the DSPs.<br />
On newer ISR routers (28xx, 38xx) you do not need the NM-HDV modules because the DSPs and VWIC can be directly installed to the motherboard.<br />
<a href="http://www.cisco.com/en/US/prod/collateral/routers/ps274/product_data_sheet09186a0080091b9c_ps259_Products_Data_Sheet.html" rel="ugc">http://www.cisco.com/en/US/prod/collateral/routers/ps274/product_data_sheet09186a0080091b9c_ps259_Products_Data_Sheet.html</a>&nbsp;<br />

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Voice is supported only on VWIC type cards. VWIC stands for Voice WAN Interface Card. So these cards can be used both for Voice and WAN (data).
Even if you have a VWIC card, you still need to install DSP modules (PVDM) on your router. DSP converts T1 voice to packet voice and vice versa (voip). On a 2600 router you need an NM-HDV network module which carries both the T1 card and the DSPs.
On newer ISR routers (28xx, 38xx) you do not need the NM-HDV modules because the DSPs and VWIC can be directly installed to the motherboard.
http://www.cisco.com/en/US/prod/collateral/routers/ps274/product_data_sheet09186a0080091b9c_ps259_Products_Data_Sheet.html [http://www.cisco.com/en/US/prod/collateral/routers/ps274/product_data_sheet09186a0080091b9c_ps259_Products_Data_Sheet.html] 


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How do we check if we have NM-HDV module on our cisco 2600? Any command.
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How do we check if we have NM-HDV module on our cisco 2600? Any command.

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We have 2 cisco 2600 with csu/dsu T1 wic cards. Since they are not the controller type T1, is there a way to setup voice channels on these two using serial ports? Pl answer.
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We have 2 cisco 2600 with csu/dsu T1 wic cards. Since they are not the controller type T1, is there a way to setup voice channels on these two using serial ports? Pl answer.

Cisco WIC card T1 CSU/DSU and voice channels

IP telephony (Internet Protocol telephony) is a general term for the technologies that use the Internet Protocol's packet-switched connections to exchange voice, fax, and other forms of information that have traditionally been carried over the dedicated circuit-switched connections of the public switched telephone network (PSTN). Using the Internet, calls travel as packets of data on shared lines, avoiding the tolls of the PSTN. The challenge in IP telephony is to deliver the voice, fax, or video packets in a dependable flow to the user.

IP Telephony

Voice over IP (VoIP) is a methodology and group of technologies for the delivery of voice communications and multimedia sessions over Internet Protocol (IP) networks, such as the Internet. Other terms commonly associated with VoIP are IP telephony, Internet telephony, broadband telephony, and broadband phone service. The term specifically refers to the provisioning of communications services (voice, fax, SMS, voice-messaging) over the public Internet, rather than via the public switched telephone network (PSTN).  Examples of the VoIP protocols are H.323, Media Gateway Control Protocol (MGCP), Session Initiation Protocol (SIP), H.248 (also known as Media Gateway Control (Megaco)), Real-time Transport Protocol (RTP), Real-time Transport Control Protocol (RTCP), Secure Real-time Transport Protocol (SRTP), Session Description Protocol (SDP), and Inter-Asterisk eXchange (IAX).

Voice Over IP

A router is a networking device that forwards data packets between computer networks. Routers perform the "traffic directing" functions on the Internet. The most familiar type of routers are home and small office cable or DSL routers that simply pass data, such as web pages, email, IM, and videos between computers and the Internet. More sophisticated routers, such as enterprise routers, connect large business or ISP networks up to the powerful core routers that forward data at high speed along the optical fiber lines of the Internet backbone. Though routers are typically dedicated hardware devices, use of software-based routers has grown increasingly common.