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I found a C1861 ISR router and I would like to play with it a learn some telephony.

I signed up for a VOIP service so I have SIP credentials. Is there a simple walkthrough anywhere to set up the SIP so I can plug a POTS phone in the FXS port and be able to place and receive calls? Also anything for configuring an IP phone in a regular switch port?

Thank you any help you may provide.

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  • Do you have the correct license for VoIP on your router?
    – Ron Maupin
    Mar 8 '18 at 3:27
  • Does this show license info? Processor board ID FTX16268279 MPC8358 CPU Rev: Part Number 0x804A, Revision ID 0x21 12 User Licenses 10 FastEthernet interfaces 1 Virtual Private Network (VPN) Module 4 Voice FXO interfaces 4 Voice FXS interfaces 1 Voice MoH interface 128K bytes of non-volatile configuration memory. 2006928K bytes of ATA CompactFlash (Read/Write) License Info: License UDI: ------------------------------------------------- Device# PID SN ------------------------------------------------- *0 C1861E-SRST-F/K9 FTX16268279 Mar 8 '18 at 3:33

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