SRST- DHCP best practice

[iptuser]

I`m installing a SRST site with the DHCP for P.C`s across the WAN with a renew time of several days e.g 5 days, normally is best to have a local DHCP for voice only on the SRST router ? It has also been suggested that I do not do this local DHCP set up but rely on the remote DHCP and the re-new time being good enough since the WAN outage should be repaired before the x day limit, also you only have to managed one DHCP. If I go with the remote DHCP and the outage goes beyond 5 days what will happen to the phones, does not having a voice only DHCP in the SRST effect anything else- thanks

 

[jeter]

When installing a SRST location we setup dhcp for voice and data... Never had any issues when the wan link failed... Calls in SRST incoming and outbound are connected to a fxo port.... Once the WAN link is up the router reverts back to call manager and all is well....

Some people are like slinkies.
Not really good for anything but they bring a smile to your face when pushed down the stairs.


Tek-TIP Member 19,650

 

[iptuser]

I`m aware of this but the data guy is saying that we will not be using a local DHCP i.e SRST router as the lease time on the address` are long enough for the recovery of the WAN- is there any issues with not having a local DHCP but rely on the IP Phone having a long lease time for the address

 

[jeter]

You have to ask yourself, what happens to your dhcp when the WAN is down?

Example, you are due to renew your ip in 24 hours, your WAN went down and is down for several days...

Will I get a new ip? I think not!!!!!

Some people are like slinkies.
Not really good for anything but they bring a smile to your face when pushed down the stairs.


Tek-TIP Member 19,650

 

[mtashiro]

If you were to go beyond the lease the IP phones will go down. But if your WAN is down for 5 days you may have bigger issues.

 

[iptuser]

Thanks for the replies, with regards to the lease time -sure the time is the issue and if the WAN is till then that`s another story but I was thinking purely from best practices and ony from IPT point of view only