Here is some concepts about protecting phone line,
Unfortunately documents about my new project is almost Confidential information as Andy said
I thought this part of document which i selected is not Confidential,


TIP and RING traces should be as short as possible and should be oriented to prevent direct or induced coupling with other signals on the host circuit card.
Current Line Device: F1 and F2 – 1.25amp. A. UL 1459 must use a current limit device. A Poly Fuse is recommended as this
device resets automatically after each power surge. B. Resistors (10ohm carbon film or SMD 1/8W minimum) may be used for non UL applications.
Over Voltage and Lightning Protection. A. DOC (Canada) may require external current limiting devices. Use 1ohm resistors
(carbon film or SMD parts 1/8W minimum) in each lead (TIP and RING). You may substitute fuses or the Poly Fuse described in Section 2. Figure 4. Low Power Ring Detection. B. For lightning prone areas where there are more than 2 storms per year,provide an earth ground connection and use a three terminal sidactor or similar device that provides metallic and longitudinal protection. This must also include the current protection in Section 2.
EMI/RFI Suppression. The capacitor/ inductor network should be located as close to the RJ-11 Jack as possible with an excellent ground path to the chassis. Capacitors C1 and C2 should not exceed 0.005µF. They must have a rating of 1.5KV and
typically have a value of 0.001µF ± 20%. Inductors L1 and L2 are ferrite cylinders and provide attenuation to high frequencies from system level components external. The required values must be empirically determined for each product design

Regards
Mehdi