cisco routers and ip pbx configuration ?

Edwards Finance > Phones

Q. This week I have been trying to find a solution how to make my Asterisk IP PBX box to work behind cisco router with NAT. I currently have problems with incomming calls after I have registered it with my sip provider. The sip registration works fine. When the call enters the linux (from internet) my ip pbx does pick up the call but no sound was passing thru. It seems like that the rtp ports arent passing thru. Could this problem be solved with "ip inspect sip" ? Or what else should I try?

A. I'm evaluating IP PBX's for a small site (20 or so users), but reliability is key (business is almost 100% dependent on the phones being up). We will be growing in the next year, and possibly with remote sites. Our vmail needs are simple and we don't need unified messaging or any type of call center applications (I don't foresee them in the future either). I've looked at the Shoretel product, the Nortel BCM, the Avaya IP Office, the Mitell 3300 series and a Cisco Call Manager. I looked at CME, but TAC doesn't officially support QSIG on CME and I absolutely need QSIG capability. Right now, my favorites are Mitel and Cisco. I've read a lot of positive newsgroup postings about both, but it seems like upgrades of CM down the road are a mess. Basically what's important is functionality, ease of management, and most importantly, reliability/uptime. I work for a network integrator that carries both Cisco and ShoreTel. If are comparing the two for your needs then ShoreTEl is a far better choise. First of all you mentioned Qsig which ShoreTel does support. CME is basically dial tone replacement and isn't easy to manage and upgrades are nasty. You should take another look at ShoreTel for sure. If you are looking at Mitel and cost is a consideration. The SX200ICP in the CX form will be a cost saving over a similar 3300ICP in the CX form. The SX200ICP is also a little stronger at mimicking a key system if that is your required setup. I only know Mitel so I tend to lean that way. Both systems are reliable and should fit your needs. They also have some more advanced features like teleworker ( running a set off the system from you home if you have DSL or other high speed ), ACD, ARS ( least cost routing ), Your Assistance ( laptop soft phone ) and all the other features of the TDM SX2000 and SX200 PBX's. The 3300ICP certainly supports QSIS as does the SX200ICP ( I believe ). Both come with a basic internal voicemail system, with an auto attendant capability for dial by name etc. The upgrade to the SX200ICP is basically plugging in a Compact Flash card with the new software and selecting the upgrade required ( pretty easy ) The 3300ICP has a windows bases "software installer" program that does pretty well everything on its own. You set up a laptop as an FTP server, download the new software from Mitel's web site into the home FTP directory and tell the software installer the IP address of your laptop. The rest is pretty easy just say if you want to backup the database and the voicemail messages and away we go. Without a voicemail backup its about 35 minutes. Any one with some IT experience should be able to handle that. The 3300 is managed via HTTP, with users having the ability to manage adding keys to their sets or groups of sets via a similar HTTP interface. If you wish to allow this type of access a separate login is created for each user or admin type person. Otherwise a central person can do all the admin. The 200ICP is managed via secure telnet. It does have a simple GUI based program for making set changes as well. Anyway hope this info is helpful. Maybe someone can give you Cisco info.

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